Latest Update

Station is currently operating with a temporary antenna (random length wire into tree). SEA 245 is directly driving the antenna tuner driving the wire against ground. I am currently running CW, RTTY, and SSB. The block diagram below is accurate to the left of the SEA 1630 antenna tuner. On the right is just the random length wire antenna.

Antenna tuner fixed! One of the inductor shorting relays in the SEA 1630 antenna tuner had welded contacts. The relay was replaced 6/30/21, so I'm back on the air with CW, RTTY, and SSB. The SEA 1630 is driving a random length wire to a tree in the front yard. This is fed against ground (the water main in the front yard).

The TU-170 timpots replaced and TU-170 retuned.

Recent updates to the RBN report add links to various fields.




Favorite band, image from the cover of a recent CRHS Journal, Solar-Terrestrial Data showing conditions for HF and VHF bands and the MUF for Boulder CO, the W6IWI QSL card, view of antenna ("Wow! You must have a really big TV"), view of W6IWI Mobile. The Optimal Working Frequency is about 0.85 times the Maximum Usable Frequency.

Search W6IWI:

The call letters W6IWI were first used by Kauko Hallikainen in the 1930s (1933 license, 1937 ARRL membership). See the 1934, 1936, 1937, and 1938 Amateur Radio Callbook. The 1930s QSL card was similar to that shown above (I may still have one of the originals somewhere). By 1952, the call had been reassigned to Carson Donaldson in Inglewood CA. He held it through 1977. I acquired the call in 2016. Prior to that, I held the call WA6FDN, and prior to that, WN6FDN. The WA6FDN license was first granted in 1969, with WN6FDN in 1968. WA6FDN shows up in the Summer 1969 Callbook. NL7XM offers a great service. He has over 100 years of Radio Amateur Callbooks and will find the first appearance of your callsign in the Callbook. For a reasonable cost, he'll provide certified copies of these pages verifying that the callsign was held by the particular person on this date. This is what he sent me for WN6FDN and WA6FDN.

WN6FDN started with a Heathkit DX-60 transmitter and a National NC-300 receiver running CW on HF. WA6FDN used a Viking Ranger transmitter running AM, CW, and RTTY on HF. RTTY used a Teletype model 15 printer (also see a slow motion video of a model 15 in operationg), and a model 14 typing reperf and transmitter distributor. W6IWI now uses an SEA 245 with a Dentron Clipperton-L amplifier running CW and SSB into a Cushcraft A3S with 40 meter adapter. Previosly, a HyGain TH-3JRS 3 elemement tri-band (10, 15, 20) beam was used. Finally, an inverted V for other bands (other than 40, 20, 15, and 10). VHF and UHF FM are covered with a Baofeng UV-5R and a Wouxun KG-UV-6X. The Wouxun KG-UV-6X normally drives an outside vertical antenna at home. Mobile info is here.

HF Station Details

Click in a box in the block diagram for more details. Antenna VSWR is tracked here. Your browser does not support the HTML5 canvas tag. ;

Maximum Usable Frequency (22.65 MHz at 16 Oct 2021 1801 GMT)

The MUF data feed stopped on June 15, 2021 and returned on July 7, 2021. There is a big gap in the data over those 3 weeks. The graph below plots the Boulder CO MUF and OWF over time (times are local at the browser). Data courtesy of Paul N0NBH. The MUF is the maximum frequency that can be used over a 3,000 km path centered on Boulder CO. The optimal working frequency is 0.85 times the MUF. Due to the large amount of data in the graph, it is pretty crowded. Zoom into a date range for a closer look. Drag over an area with the left mouse button down to zoom to that area. Right click to go back to the full graph.

W6IWI HF Activity

The table below shows recent contacts logged on qrz.com.

RBN Report

The table below is generated by a PHP script that pulls JSON data from the Reverse Beacon Network, parses it, calculates distance and bearing based on latitude and longitude, then shows data for the last 250 spots. Frequency changes greater than 1 kHz or time changes greater than 1 hour are shown in bold. The Rx links link to the QRZ page for the station. The SNR links link to a graph of signal to noise ratio versus time for that receiver and band (data limited to 250 spots total from RBN)

The background color is green if the distance is greater than 3,000 miles. The Relative Distance column has a * for every 200 miles.

TimeRxFreq (kHz)SNRModeSpeedRx LocationDistance and BearingRelative Distance
0624z 16 OctK7EG 7083.9 17 dB RTTY45 bpsAuburn, WA1963 km (1220 miles) at 334.3 degrees******
0623z 16 OctK9LC 7083.9 13 dB RTTY45 bpsRockford, IL2257 km (1402 miles) at 52.9 degrees*******
0623z 16 OctK1TTT 7083.9 22 dB RTTY45 bpsPeru, MA3525 km (2190 miles) at 59.5 degrees**********
0619z 16 OctWZ7I 7083.9 14 dB RTTY45 bpsPipersville, PA3328 km (2068 miles) at 63.2 degrees**********
0618z 16 OctVE7CC 7083.9 24 dB RTTY45 bpsMaple Ridge, BC2156 km (1340 miles) at 336.7 degrees******
0618z 16 OctWE9V 7083.8 18 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
0618z 16 OctAC0C-1 7083.9 33 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
0618z 16 OctKO7SS-7 7083.9 31 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0603z 16 OctK9LC 7083.9 10 dB RTTY45 bpsRockford, IL2257 km (1402 miles) at 52.9 degrees*******
0602z 16 OctVE7CC 7083.9 29 dB RTTY45 bpsMaple Ridge, BC2156 km (1340 miles) at 336.7 degrees******
0602z 16 OctKO7SS-7 7083.9 31 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0602z 16 OctAC0C-1 7083.9 30 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
0602z 16 OctK7EG 7083.9 14 dB RTTY45 bpsAuburn, WA1963 km (1220 miles) at 334.3 degrees******
0602z 16 OctWE9V 7083.8 16 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
0218z 16 OctKE3BK 7083.9 15 dB RTTY45 bpsMountain House, CA1169 km (726 miles) at 307.1 degrees***
0212z 16 OctK9LC 7083.9 13 dB RTTY45 bpsRockford, IL2257 km (1402 miles) at 52.9 degrees*******
0212z 16 OctK7EG 7083.9 16 dB RTTY45 bpsAuburn, WA1963 km (1220 miles) at 334.3 degrees******
0212z 16 OctK1TTT 7083.9 20 dB RTTY45 bpsPeru, MA3525 km (2190 miles) at 59.5 degrees**********
0212z 16 OctKO7SS 7083.9 29 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0212z 16 OctKO7SS-7 7083.9 30 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0212z 16 OctN6TV 7083.9 21 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
0212z 16 OctAC0C-1 7083.9 35 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
0211z 16 OctVE7CC 7083.9 14 dB RTTY45 bpsMaple Ridge, BC2156 km (1340 miles) at 336.7 degrees******
0211z 16 OctWE9V 7083.8 20 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
0211z 16 OctW6YX 7083.9 29 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
0211z 16 OctWZ7I 7083.9 18 dB RTTY45 bpsPipersville, PA3328 km (2068 miles) at 63.2 degrees**********
0142z 16 OctK5TR 7110.0 7 dB CW12 wpmAustin, TX1217 km (756 miles) at 95.2 degrees***
1842z 15 OctWE9V 14083.8 13 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
1842z 15 OctKO7SS 14083.9 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1838z 15 OctNC7J 7083.9 13 dB RTTY45 bpsLayton, UT1028 km (639 miles) at 354.8 degrees***
1838z 15 OctKO7SS 7083.9 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1838z 15 OctW6YX 7083.9 24 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
1822z 15 OctNC7J 7083.9 10 dB RTTY45 bpsLayton, UT1028 km (639 miles) at 354.8 degrees***
1815z 15 OctW6YX 7083.9 24 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
1815z 15 OctKO7SS 7083.9 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1805z 15 OctKO7SS 14083.9 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0426z 15 OctAC0C-1 3555.0 12 dB CW12 wpmLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
0426z 15 OctN6TV 3555.0 6 dB CW13 wpmSan Jose, CA1159 km (720 miles) at 304 degrees***
0426z 15 OctNC7J 3555.0 5 dB CW13 wpmLayton, UT1028 km (639 miles) at 354.8 degrees***
0426z 15 OctWE9V 3555.0 6 dB CW13 wpmBristol, WI2339 km (1453 miles) at 52.9 degrees*******
0426z 15 OctAC0C-1 3555.0 12 dB CW13 wpmLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
0414z 15 OctK9IMM 7055.0 6 dB CW13 wpmMount Horeb, WI2225 km (1382 miles) at 50.5 degrees******
0414z 15 OctW8WWV 7055.0 15 dB CW12 wpmChesterland, OH2828 km (1757 miles) at 59.3 degrees********
0412z 15 OctKO7SS 7055.0 24 dB CW12 wpmMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0412z 15 OctKO7SS-7 7055.0 26 dB CW12 wpmMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0412z 15 OctWE9V 7055.0 20 dB CW12 wpmBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2136z 14 OctKO7SS 14083.9 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2136z 14 OctWE9V 14083.8 11 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2136z 14 OctKO7SS-7 14083.9 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0454z 14 OctKO7SS 3555.0 24 dB CW15 wpmMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0454z 14 OctKO7SS-7 3555.0 26 dB CW15 wpmMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0453z 14 OctKU7T 3555.0 11 dB CW12 wpmNorth Bend, WA1965 km (1221 miles) at 335.2 degrees******
0453z 14 OctW6YX 3555.0 16 dB CW13 wpmStanford, CA1200 km (745 miles) at 304 degrees***
0453z 14 OctN6TV 3555.0 7 dB CW13 wpmSan Jose, CA1159 km (720 miles) at 304 degrees***
0440z 14 OctKO7SS 7055.0 24 dB CW12 wpmMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0440z 14 OctK9IMM 7055.0 20 dB CW12 wpmMount Horeb, WI2225 km (1382 miles) at 50.5 degrees******
0440z 14 OctK9LC 7055.0 8 dB CW11 wpmRockford, IL2257 km (1402 miles) at 52.9 degrees*******
0147z 14 OctKO7SS-7 14083.9 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0147z 14 OctKO7SS 14083.9 31 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2211z 13 OctK1TTT 14083.9 11 dB RTTY45 bpsPeru, MA3525 km (2190 miles) at 59.5 degrees**********
2210z 13 OctKO7SS-7 14083.9 20 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2210z 13 OctKO7SS 14083.9 29 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1841z 13 OctKO7SS-7 14083.9 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
1840z 13 OctKO7SS 14083.9 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1825z 13 OctKO7SS 14083.9 31 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1825z 13 OctKO7SS-7 14083.9 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
1720z 13 OctW6YX 14083.9 14 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
1720z 13 OctKO7SS-7 14083.9 23 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
1720z 13 OctKO7SS 14083.9 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0356z 13 OctW6YX 7058.0 19 dB CW15 wpmStanford, CA1200 km (745 miles) at 304 degrees***
0354z 13 OctNC7J 7058.0 13 dB CW14 wpmLayton, UT1028 km (639 miles) at 354.8 degrees***
0353z 13 OctKO7SS 7058.0 23 dB CW11 wpmMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0353z 13 OctK5TR 7058.0 19 dB CW12 wpmAustin, TX1217 km (756 miles) at 95.2 degrees***
0353z 13 OctKO7SS-7 7058.0 24 dB CW11 wpmMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2159z 12 OctWE9V 14083.8 16 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2159z 12 OctKO7SS-7 14083.9 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2036z 12 OctKO7SS-7 14083.9 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2036z 12 OctWE9V 14083.8 14 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2036z 12 OctKO7SS 14083.9 32 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2021z 12 OctWE9V 14083.8 15 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2020z 12 OctKO7SS-7 14083.9 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2020z 12 OctKO7SS 14083.8 30 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0406z 12 OctVE7CC 7049.0 16 dB CW13 wpmMaple Ridge, BC2156 km (1340 miles) at 336.7 degrees******
0406z 12 OctW4KAZ 7049.0 17 dB CW13 wpmCary, NC2987 km (1856 miles) at 72.8 degrees*********
0406z 12 OctN4ZR 7049.0 17 dB CW12 wpmPhoenix, MD3198 km (1987 miles) at 64.9 degrees*********
0406z 12 OctKV4TT 7049.0 6 dB CW13 wpmNorth Myrtle Beach, SC3006 km (1868 miles) at 77.1 degrees*********
0406z 12 OctKD7YZ 7049.0 10 dB CW12 wpmGreenup, KY2628 km (1633 miles) at 66 degrees********
0405z 12 OctW2NAF 7049.0 19 dB CW12 wpmSpring Brook, PA3297 km (2049 miles) at 61.3 degrees**********
0405z 12 OctW3OA 7049.0 24 dB CW13 wpmMooresville, NC2792 km (1734 miles) at 73.3 degrees********
2156z 11 OctWE9V 14083.8 13 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2155z 11 OctKO7SS 14083.9 31 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2155z 11 OctKO7SS-7 14083.9 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2124z 11 OctK9LC 14083.9 10 dB RTTY45 bpsRockford, IL2257 km (1402 miles) at 52.9 degrees*******
2120z 11 OctWE9V 14083.8 23 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2120z 11 OctKO7SS-7 14083.9 23 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2120z 11 OctKO7SS 14083.9 32 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2109z 11 OctKO7SS-7 14083.9 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2109z 11 OctWE9V 14083.8 20 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2109z 11 OctKO7SS 14083.9 33 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2109z 11 OctK9LC 14083.9 16 dB RTTY45 bpsRockford, IL2257 km (1402 miles) at 52.9 degrees*******
1505z 11 OctW6YX 14083.9 28 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
1505z 11 OctWE9V 14083.8 16 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
1504z 11 OctKO7SS 14083.9 33 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1504z 11 OctN6TV 14083.9 12 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
1504z 11 OctKO7SS-7 14083.9 25 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2306z 10 OctKO7SS-7 14083.8 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2306z 10 OctKO7SS 14083.9 31 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2221z 10 OctKO7SS-7 14083.8 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2221z 10 OctWE9V 14083.8 22 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2221z 10 OctKO7SS 14083.9 33 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2205z 10 OctKO7SS 14083.9 33 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2205z 10 OctKO7SS-7 14083.9 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0600z 10 OctW6YX 7053.0 21 dB CW14 wpmStanford, CA1200 km (745 miles) at 304 degrees***
0600z 10 OctK9IMM 7053.0 14 dB CW14 wpmMount Horeb, WI2225 km (1382 miles) at 50.5 degrees******
0600z 10 OctKU7T 7053.0 14 dB CW14 wpmNorth Bend, WA1965 km (1221 miles) at 335.2 degrees******
0600z 10 OctAC0C-1 7053.0 27 dB CW15 wpmLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
0407z 10 OctW8WTS 7053.0 7 dB CW15 wpmChagrin Falls, OH2839 km (1764 miles) at 59.6 degrees********
0403z 10 OctVE7CC 7053.0 11 dB CW14 wpmMaple Ridge, BC2156 km (1340 miles) at 336.7 degrees******
0403z 10 OctW8WWV 7053.0 14 dB CW14 wpmChesterland, OH2828 km (1757 miles) at 59.3 degrees********
2010z 09 OctAC0C-1 14083.8 16 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
2010z 09 OctW6YX 14083.8 34 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
2010z 09 OctN6TV 14083.8 12 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
2010z 09 OctKO7SS-7 14083.8 20 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2008z 09 OctVE7CC 18074.0 6 dB CW15 wpmMaple Ridge, BC2156 km (1340 miles) at 336.7 degrees******
2006z 09 OctK7EG 18074.0 14 dB CW13 wpmAuburn, WA1963 km (1220 miles) at 334.3 degrees******
2006z 09 OctVE6WZ 18074.1 13 dB CW13 wpmCalgary, AB2237 km (1390 miles) at 353.7 degrees******
2006z 09 OctK9LC 18074.0 10 dB CW13 wpmRockford, IL2257 km (1402 miles) at 52.9 degrees*******
2006z 09 OctKD7YZ 18074.0 5 dB CW13 wpmGreenup, KY2628 km (1633 miles) at 66 degrees********
2006z 09 OctK1TTT 18074.0 14 dB CW13 wpmPeru, MA3525 km (2190 miles) at 59.5 degrees**********
2006z 09 OctKO7SS-7 18074.0 26 dB CW13 wpmMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2006z 09 OctK9IMM 18074.1 18 dB CW13 wpmMount Horeb, WI2225 km (1382 miles) at 50.5 degrees******
2006z 09 OctKM3T 18074.0 12 dB CW13 wpmAmherst, NH3644 km (2264 miles) at 59.1 degrees***********
1946z 09 OctVE6WZ 14069.1 7 dB CW15 wpmCalgary, AB2237 km (1390 miles) at 353.7 degrees******
1946z 09 OctVE6JY 14069.1 16 dB CW15 wpmLamont, AB2436 km (1514 miles) at 357.1 degrees*******
1944z 09 OctNC7J 14069.0 7 dB CW15 wpmLayton, UT1028 km (639 miles) at 354.8 degrees***
1944z 09 OctAC0C-1 14069.0 10 dB CW15 wpmLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
1944z 09 OctK5TR 14069.0 21 dB CW15 wpmAustin, TX1217 km (756 miles) at 95.2 degrees***
1944z 09 OctN6TV 14069.0 8 dB CW15 wpmSan Jose, CA1159 km (720 miles) at 304 degrees***
1944z 09 OctK9IMM 14069.0 8 dB CW15 wpmMount Horeb, WI2225 km (1382 miles) at 50.5 degrees******
0350z 09 OctNC7J 7041.0 11 dB CW15 wpmLayton, UT1028 km (639 miles) at 354.8 degrees***
0350z 09 OctKO7SS-7 7041.0 25 dB CW14 wpmMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2221z 08 OctWE9V 14083.8 10 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2220z 08 OctAC0C-1 14083.9 24 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
2220z 08 OctKO7SS 14083.9 33 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2220z 08 OctKO7SS-7 14083.8 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2157z 08 OctWE9V 14083.8 13 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2157z 08 OctKO7SS 14083.9 34 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2157z 08 OctN6TV 14083.9 23 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
2157z 08 OctAC0C-1 14083.9 21 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
2157z 08 OctKO7SS-7 14083.9 23 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
1810z 08 OctKO7SS-7 14083.8 23 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
1810z 08 OctAC0C-1 14083.9 19 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
1810z 08 OctKO7SS 14083.9 35 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0222z 08 OctKO7SS-7 14083.8 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0222z 08 OctKO7SS 14083.9 37 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2222z 07 OctKO7SS-7 14083.8 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2222z 07 OctKO7SS 14083.9 33 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2222z 07 OctAC0C-1 14083.9 26 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
2222z 07 OctW6YX 14083.9 17 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
1650z 07 OctAC0C-1 14083.9 27 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
1650z 07 OctKO7SS 14083.9 35 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1650z 07 OctKO7SS-7 14083.9 23 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0159z 07 OctKO7SS 14083.9 35 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0159z 07 OctKO7SS-7 14083.8 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
1746z 06 OctN6TV 14083.9 22 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
1746z 06 OctKO7SS-7 14083.9 24 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
1746z 06 OctKO7SS 14083.9 37 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1746z 06 OctAC0C-1 14083.9 30 dB RTTY45 bpsLouisburg, KS1658 km (1030 miles) at 58.4 degrees*****
0445z 06 OctKO7SS-7 14083.8 23 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0445z 06 OctKO7SS 14083.9 36 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0433z 06 OctKO7SS 14083.9 37 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0433z 06 OctKO7SS-7 14083.8 23 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0229z 06 OctW6YX 14083.9 10 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
0228z 06 OctKO7SS 14083.9 37 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0228z 06 OctKO7SS-7 14083.8 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0216z 06 OctN6TV 14083.9 12 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
0215z 06 OctKO7SS 14083.9 36 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
0215z 06 OctKO7SS-7 14083.8 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2240z 05 OctK1TTT 14083.9 14 dB RTTY45 bpsPeru, MA3525 km (2190 miles) at 59.5 degrees**********
2239z 05 OctWE9V 14083.8 21 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2239z 05 OctW6YX 14083.9 16 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
2239z 05 OctKM3T 14083.9 18 dB RTTY45 bpsAmherst, NH3644 km (2264 miles) at 59.1 degrees***********
2239z 05 OctKO7SS 14083.9 34 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
2239z 05 OctN6TV 14083.9 25 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
2239z 05 OctKO7SS-7 14083.9 22 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2229z 05 OctK1TTT 14083.9 12 dB RTTY45 bpsPeru, MA3525 km (2190 miles) at 59.5 degrees**********
2228z 05 OctW6YX 14083.9 17 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
2228z 05 OctKO7SS-7 14083.8 21 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
2228z 05 OctN6TV 14083.9 17 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
2228z 05 OctWE9V 14083.8 14 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2228z 05 OctKO7SS 14083.9 32 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1716z 05 OctKO7SS 14083.9 35 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees
1716z 05 OctN6TV 14083.9 24 dB RTTY45 bpsSan Jose, CA1159 km (720 miles) at 304 degrees***
1716z 05 OctKO7SS-7 14083.9 20 dB RTTY45 bpsMt. Lemmon, AZ66 km (41 miles) at 11.5 degrees
0343z 05 OctW4KAZ 7035.0 15 dB CW14 wpmCary, NC2987 km (1856 miles) at 72.8 degrees*********
0343z 05 OctWC2L 7035.0 10 dB CW13 wpmNiskayuna, NY3461 km (2151 miles) at 58.8 degrees**********
0343z 05 OctKD7YZ 7035.0 3 dB CW13 wpmGreenup, KY2628 km (1633 miles) at 66 degrees********
2332z 04 OctWE9V 14083.8 13 dB RTTY45 bpsBristol, WI2339 km (1453 miles) at 52.9 degrees*******
2331z 04 OctW6YX 14083.9 15 dB RTTY45 bpsStanford, CA1200 km (745 miles) at 304 degrees***
2331z 04 OctKO7SS 14083.9 33 dB RTTY45 bpsMt. Lemmon, AZ63 km (39 miles) at 19.2 degrees

The plot below shows a historic plot of W6IWI HF CW and RTTY activity.

Also see here for a graphical representation of all RBN data. There is also a new version under development that shows similar graphs but also paths between transmit and receive sites on a map.

Search RBN for Your Station

Enter your call and click Submit to see what RBN has on you. This can be useful for testing different antennae. Transmit TEST DE CALLSIGN a few times on one antenna, switch to the other, change frequency a bit (maybe 100 Hz) and transmit again. You should see spots recorded at several locations for each antenna. Compare the reported SNR to get an idea how the different antennae perform. Click Show/Hide on the right side of the results page to enable a map with grayline showing the location of the receive sites. If your site is not shown correctly, update your location at QRZ.COM. Once logged in, select your call (right side of menu bar), then Edit your call, then Map, Grid Square and Coordinate settings. RBN uses these coordinates to place your station.

NOTE: RBN only reports CQ or TEST. It does not report every QSO. Send one of the following (I use CW and RTTY) to generate RBN spots:

Also, note that RTTY is only reported if it is at "tape speed." Hand typed RTTY is not reported.

Call Sign:

You can also use the form below to get a more detailed RBN report.

Call Sign:

Voice of America Coverage Analysis Program

VOCAP for ham radio. Originally written for the Voice of America, this predicts the best frequency between two locations at a specific time. For more info, see www.vocap.com.

Find Hams in your Neighborhood

Amateur Radio License Map maps US amateur radio operators in an area centered on a call sign, grid square, zip code, or street address. Pretty neat!

The Ham Shack

Here's an overall view of the operationg position (a rolltop desk). On the top shelf ia a lamp with a mechanical watt-hour meter. On the base to the right is a more modern version, the Kill A Watt AC power meter that measures line voltage, frequency, load current, load power, load VA, power factor, and kWH (pretty amazing). To the right of that are the two VHF/UHF handheld radios (Wouxun KG-UV-6X and a Baofeng UV-5R). The Wouxon is used as a base station with an outside antenna and a speaker/microphone. To the left of the handheld radios, you can see a couple antennae for using the handhelds portable. Behind the handhelds is a black carrying case holding the SARK-110 antenna analyzer (another truly amazing instrument). To the right is the Dentron Clipperton-L with a pair of Daiwa 501H RF wattmeters on top. The left one measures the transceiver output power, while the right one reads the amplifier output power. To the right of that is a USL CM-8E cinema booth monitor. The center channel of the CM-8E is bridged across the balanced audio line between the SEA 245 and its control head. It's used as a headphone amplifier since the SEA 245 does not have a headphone jack. In addition, the equalizer in the CM-8E is set to a narrow bandpass to act as a CW filter. On the desktop surface, starting on the left is the Chromebook laptop. To the right of the laptop is a Flesher TU-170 Teletype terminal unit with a Wave 2 handheld digital scope as an XY tuning indicator. To the right of the TU-170 is the control head for the SEA 245 HF transceiver. Below the TU-170 and SEA245 is the controller for the MFJ HAM-IV rotator that aims the Cushcraft A3S antenna. To the right (the silver box) is a switch that switches 12 VDC to the MFJ-4712 antenna switch. The bug and key are to the right. The bug is wired in parallel with the key. There are several diodes on the key so the bug and key can drive the code practice oscillator part of the MFJ 557 to provide sidetone, drive the SEA 245 and drive the CW ID input of the TU-170. On the far right is the Teletype model 15.
Dentron Clipperton-L with the cover removed. The power supply is on the left, the output tuning network on the front right, and the four 572B triodes on the right rear.
Here's a view of the SEA 245 control head. It has an RS-485 bus (called SEABUSS) that carries control information between the control head and the trnsceiver. It can also communicate with the SEA 1630 tuner, but I currently have the tuner operating stand alone. Instead of being on SEABUSS, the tuner (of course) gets the RF and PTT. It returns an open collector signal that goes low when the tuner has tuned. When transmitting, the SQL indicator (squelch) is replaced with TND indicating the tuner has tuned the antenna. Besides SEABUSS, the control head connects to the SEA 245 transceiver with a balanced audio line, the PTT line, a power on/off control (switch to ground to turn on the radio), and switched +12V. The balanced audio line is run as an analog tristate bus. When receiving, the transceiver puts audio on the bus. When transmitting, the control head puts audio on the bus. On a ship, there are typically multiple control heads connected to a single transceiver using SEABUSS.

On the right is an MFJ-557 code practice oscillator. The straight key keys both the code practice oscillator and the SEA 245 transceiver. The code practice oscillator provides "side tone." You may see a few diodes on the left side of the straight key. They provide isolation between the code practice oscillator, the TU-170 CW ID input, and the SEA 245 transceiver.

To the left of the MFJ-557 is a Vibroplex Blue Racer Deluxe. This is serial number 229386 originally owned by my father, K. E. Hallikainen (Hal). This list puts the manufacture date as 1962, which seems a bit late. Note the Round Arm Vari-Speed Accessory added to the bug. This slows it down to about 13 WPM. The bug is connected in parallel with the straight key so it also keys the code practice oscillator, the SEA 245 transceiver, and the CW ID input of the TU=170.

This is the actual SEA 245 transceiver (bottom right black box with blue Power Pole connectors). Above the SEA 245 is the SEA 1630 antenna tuner (see below for more details). To the left of the SEA 245 is the Astron SS-50M 12V, 50A power supply to power the SEA 245. Just to the right, but not shown, is a APX SUA2200 UPS that can run the station (without the Clipperton L) for an hour or two. The UPS weighs 139 pounds!

The Work Bench

Here's a veiw of the work bench. Test equipment includes a Belar FMM-2 modulation monitor. On top of that is homebrew frequency converter that converts several frequencies to the 650 kHz IF input frequency. Other equipment shown includes an audio voltmeter, oscilloscope, audio generator, distortion analyzer, and a small USB logic analyzer. There's a desktop Windows computer shown running a G4L backup. The large microphone is used for web conferences. The PTT switch on it enables the microphone and mutes the speakers making conference calls pretty easy. To the left of the computer is a CZUR book scanner I use mostly to scan broadcast equipment manuals (see https://bh.hallikainen.org ). It's a pretty amazing scanner. It takes a high resolution photograph of a pair of pages of an open book and generates PDF with background OCR. While photographing the book, it puts a few lines across the book with a red laser. It then adjusts the image to make these lines straight, flattening out the curve of the pages as they approach the binding.

Antenna Tuner

Here's a view of the Seacom SEA 1630 antenna tuner with the cover removed. It is designed to drive a wire antenna on a ship, so there is a ceramic insulator on the top to connect the wire to. Here, the tuner is driving coax (to the balun driving the inverted V). Therefore, an SO-239 was added to the side of the tuner. AWG #6 wire connects the SO-239 to the antenna tuner output at the ceramic insulator and to the ground plate in the tuner. The tuner is a pi network with capacitors to ground at the input and ouput and an inductor between the input and output. Both the inductor and capacitors consist of several binary weighted inductors or capacitors. Relays short out the inductor sections when they are not needed. Relays also ground the low side of the input and output capacitors as required. The microcontroller (in the metal box) drives the relays as appropriate to put the minimum SWR on the input. Also visible on the bottom right of the tuner is a "doorbell button." This allows the transmitter to be keyed at the tuner for checking its operation. This photo shows the tuner when it was outside As noted in the block diagram above, the tuner is now in the shack, immediately above the transceiver. It is electrically between the SEA245 and the Dentron Clipperton-L. When the amplifier is not in use, its internal bypass relay (also used in receive) connects the input to the output. The SEA 1630 then matches the antenna, as seen at this end of the transmission line, to the transceiver. When the Dentron Clipperton-L is in use, the SEA 1630 matches the transceiver to the untuned input of the Dentron Clipperton-L.

Power Line Noise

My adventures with power line noise. Xcel Energy did a lot of work to solve it. Now I see some noise the day after a rain storm, but generally noise is not synchronized with the line. I look forward to a power outage go see how much noise goes away. There seems to still be quite a bit of noise, but it is not synchronized with the power line. It could be switching power supplies in the neighborhood or may just be th way the HF fands are. I can drop AC power to the QTH and the noise level remains the same, so it appears to be from outside.

Ham Radio Resources

Ham radio resources will be collected here.

Interesting Stuff

Here's a short list of interesting radio stuff.
Broadcast History - My own online collection of broadcast equipment manuals along with LOTS of other interesting links.
California Histrical Radio Society - A great group of people collecting old broadcast equipment and history. They publish an excellent magazine that has included stuff like restoration of a mechanical television and other wonderful articles. The museum is in a 1900 telephone exchange building in Alameda CA.
Restoring a Teletype model 19 - Great series of videos on restoring a Model 19. Includes a visit to Mr. RTTY, the ultimate Teletype parts supplier.
Maritime Radio Historical Society - An operating Morse radiotelegraph shore station. The transmit site is in Bolinas CA, and the receive site and control point is in Pt. Reyes Station CA. Here are some photos from our visit in 2015. This is a wonderful project!
Remote Ham Radio - Can't put up a 200 foot tower with a four element 40 meter Yagi and 1.5 kW amplifier in your backyard? Operate one of these stations from your kitchen table with a web browser. There's an annual membership fee plus a per minute charge for use of the stations. But, this is an interesting way to get on HF from a condo with strict CC&Rs.
Reverse Beacon Network - Software defined radio receivers around the world are continuously monitoring the ham bands. These SDR receivers drive "skimmer" software that decodes CW and various digital modes. Send CQ or TEST DE CALL and see where you are received, the signal to noise ratio, and the speed (such as CW WPM). Another amazing intersection of ham radio and the Internet.
Web SDR - Software defined radio receivers around the world. In simplified form, these receivers connect an antenna to an analog to digital converter which drives an Ethernet interface (with an FPGA between) which drives a server. All tuning, filtering, and demodulation happens in the server. Multiple users use a web interface to receive the frequency of interest to that user. Each user operates their SDR software independently. It's a great way to hear what your transmitter sounds like. The web sdr can record the audio and send you the audio file. Key clicks, chirp, good speech quality? Web SDR lets you know.
Kiwi SDR - Another software defined radio running on very limited hardware. It supports 4 users and includes decoders for CW, RTTY, FAX, Loran C, Navtex, and more (see the list under Extension)
Jean Shepherd was an announcer on WOR and wrote and narrated the movie "A Christmas Story." He talked about ham radio several times on WOR. Jean Shepherd audio clips
Contra Dance - Great Fun!

Comments?

I look forward to your comments! Write me at harold@w6iwi.org.