W6IWI, Tucson AZ

We moved from Arvada CO to Tucson AZ in 2021. An archive of the Colorado station is here. This page describes the current station in AZ.




Favorite band, image from the cover of a recent CRHS Journal, an old Schlitz magazine ad, Solar-Terrestrial Data showing conditions for HF and VHF bands and the MUF for Boulder CO, something about FT8, the W6IWI QSL card, view of W6IWI Mobile. The Optimal Working Frequency is about 0.85 times the Maximum Usable Frequency.

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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. In December 1969, I took the exam for the First Class Radiotelephone License with Radar Endorsement at the FCC office in San Francisco. That license was later replaced by the FCC with the General Radiotelephone Operator's License. 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 RTTY, CW and SSB into a Zero Five 30 Foot Flagpole Antenna. VHF and UHF FM are covered with a Baofeng UV-5R and a Wouxun KG-UV-6X. The Wouxun KG-UV-6X normally drives a Diamond X50A vertical antenna at home. Mobile info is here.

HF Station Details

Click in a box in the block diagram for more details.

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Maximum Usable Frequency (15.95 MHz at 13 Apr 2024 1600 GMT)

Now and then the MUF data feed is lost. When that happens, the chart below says "Cannot read properties of undefined (reading 'length')".
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.

The graph shows the MUF and OWF for the past two days. Drag right to see previous values. Use the mouse scroll wheel to zoom in and out. Right click to get back to the original view.

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 100 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, mode (CW or RTTY), and band (data limited to 100 spots 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.


RBN Data for W6IWI, lat/long 32.233624, -110.870743 as reported by RBN.

TimeRxFreq (kHz)SNRModeSpeedRx LocationDistance and BearingRelative Distance
0412z 13 AprAA4VV 14052.0 31 dB CW16 wpmLexington, NC2834 km (1761 miles) at 73.4 degrees********
0412z 13 AprW3LPL 14052.0 13 dB CW15 wpmGlenwood, MD3131 km (1945 miles) at 65.9 degrees*********
0410z 13 AprW1NT-2 14052.0 13 dB CW16 wpmNewton, NH3665 km (2277 miles) at 59.6 degrees***********
0410z 13 AprAA0O 14052.0 7 dB CW16 wpmSaint Petersburg, FL2756 km (1712 miles) at 93 degrees********
0410z 13 AprW8WTS 14052.0 13 dB CW15 wpmChagrin Falls, OH2813 km (1747 miles) at 60.3 degrees********
0406z 13 AprK5EM 14052.0 16 dB CW15 wpmSeattle, WA1969 km (1224 miles) at 334 degrees******
0406z 13 AprN9CO 14052.0 15 dB CW15 wpmSycamore, IL2242 km (1393 miles) at 54.7 degrees******
0406z 13 AprKO7SS 14052.0 43 dB CW16 wpmMt. Lemmon, AZ23 km (14 miles) at 18.1 degrees
0406z 13 AprTI7W 14052.0 33 dB CW16 wpmGuanacaste, Costa Rica3566 km (2216 miles) at 126.3 degrees***********
0406z 13 AprKH6LC 14052.0 20 dB CW16 wpmKeaau, HI4652 km (2891 miles) at 264.3 degrees**************
0406z 13 AprKP3CW 14052.0 23 dB CW15 wpmSan Jan, PR4724 km (2935 miles) at 97.9 degrees**************
0406z 13 AprVE6AO 14052.0 30 dB CW16 wpmCalgary, AB2113 km (1313 miles) at 354.1 degrees******
0406z 13 AprVE6WZ 14051.9 29 dB CW15 wpmCalgary, AB2196 km (1364 miles) at 353.4 degrees******
0406z 13 AprK9IMM 14052.0 28 dB CW16 wpmMount Horeb, WI2194 km (1363 miles) at 51.3 degrees******
0406z 13 AprW8WWV 14052.0 29 dB CW16 wpmChesterland, OH2802 km (1741 miles) at 60 degrees********
0400z 13 AprAA0O 14052.0 5 dB CW15 wpmSaint Petersburg, FL2756 km (1712 miles) at 93 degrees********
0400z 13 AprVE7CC 14052.0 8 dB CW15 wpmMaple Ridge, BC2120 km (1317 miles) at 336.1 degrees******
0400z 13 AprS53A 14052.0 21 dB CW15 wpmLjubljana, Slovenia9742 km (6053 miles) at 34.7 degrees******************************
0400z 13 AprW8WTS 14052.0 7 dB CW15 wpmChagrin Falls, OH2813 km (1747 miles) at 60.3 degrees********
0400z 13 Apr3V8SS 14052.0 15 dB CW15 wpmHammam Sousse, Tunisia10393 km (6458 miles) at 44.6 degrees********************************
0400z 13 AprJ68HZ 14052.2 25 dB CW15 wpmSoufriere, St. Lucia5436 km (3377 miles) at 100.1 degrees****************
0400z 13 AprK9LC 14052.0 17 dB CW15 wpmRockford, IL2227 km (1384 miles) at 53.7 degrees******
0400z 13 AprN7TUG 14052.2 13 dB CW15 wpmSeattle, WA1973 km (1226 miles) at 333.9 degrees******
0400z 13 AprAA4VV 14052.0 15 dB CW15 wpmLexington, NC2834 km (1761 miles) at 73.4 degrees********
0115z 13 AprKH6LC 14083.9 13 dB RTTY45 bpsKeaau, HI4652 km (2891 miles) at 264.3 degrees**************
0115z 13 AprNN3RP 14083.9 12 dB RTTY45 bpsWashington, DC3129 km (1944 miles) at 66.6 degrees*********
0114z 13 AprWE9V 14083.8 33 dB RTTY45 bpsBristol, WI2309 km (1435 miles) at 53.7 degrees*******
0114z 13 AprN6TV 14083.9 30 dB RTTY45 bpsSan Jose, CA1141 km (708 miles) at 302.1 degrees***
0114z 13 AprNU6XB 14083.9 14 dB RTTY45 bpsBerkeley, CA1213 km (754 miles) at 304.4 degrees***
0114z 13 AprWZ7I 14083.9 33 dB RTTY45 bpsPipersville, PA3304 km (2053 miles) at 63.8 degrees**********
0114z 13 AprVE7CC 14083.9 12 dB RTTY45 bpsMaple Ridge, BC2120 km (1317 miles) at 336.1 degrees******
0114z 13 AprW6BB 14083.9 20 dB RTTY45 bpsBerkeley, CA1213 km (754 miles) at 304.4 degrees***
0114z 13 AprKE3BK 14083.9 37 dB RTTY45 bpsMountain House, CA1149 km (714 miles) at 305.3 degrees***
0114z 13 AprK9LC 14083.9 24 dB RTTY45 bpsRockford, IL2227 km (1384 miles) at 53.7 degrees******
0114z 13 AprW6YX 14083.9 44 dB RTTY45 bpsStanford, CA1182 km (734 miles) at 302.2 degrees***
2232z 11 AprN6TV 14083.9 27 dB RTTY45 bpsSan Jose, CA1141 km (708 miles) at 302.1 degrees***
2232z 11 AprWE9V 14083.8 30 dB RTTY45 bpsBristol, WI2309 km (1435 miles) at 53.7 degrees*******
2232z 11 AprK6FOD 14083.9 33 dB RTTY45 bpsSouth Pasadena, CA706 km (438 miles) at 289.1 degrees**
2232z 11 AprK9LC 14083.9 24 dB RTTY45 bpsRockford, IL2227 km (1384 miles) at 53.7 degrees******
2232z 11 AprKE3BK 14083.9 34 dB RTTY45 bpsMountain House, CA1149 km (714 miles) at 305.3 degrees***
2232z 11 AprW6BB 14083.9 22 dB RTTY45 bpsBerkeley, CA1213 km (754 miles) at 304.4 degrees***
2232z 11 AprWZ7I 14083.9 18 dB RTTY45 bpsPipersville, PA3304 km (2053 miles) at 63.8 degrees**********
2232z 11 AprW6YX 14083.9 37 dB RTTY45 bpsStanford, CA1182 km (734 miles) at 302.2 degrees***
2232z 11 AprWC2L 14083.9 21 dB RTTY45 bpsNiskayuna, NY3434 km (2134 miles) at 59.4 degrees**********
2214z 10 AprK9LC 14083.9 18 dB RTTY45 bpsRockford, IL2227 km (1384 miles) at 53.7 degrees******
2213z 10 AprWZ7I 14083.9 16 dB RTTY45 bpsPipersville, PA3304 km (2053 miles) at 63.8 degrees**********
2213z 10 AprWE9V 14083.8 25 dB RTTY45 bpsBristol, WI2309 km (1435 miles) at 53.7 degrees*******
2213z 10 AprWC2L 14083.9 16 dB RTTY45 bpsNiskayuna, NY3434 km (2134 miles) at 59.4 degrees**********
2213z 10 AprN6TV 14083.9 19 dB RTTY45 bpsSan Jose, CA1141 km (708 miles) at 302.1 degrees***
2213z 10 AprAC0C-1 14083.9 24 dB RTTY45 bpsLouisburg, KS1632 km (1014 miles) at 59.6 degrees*****
2213z 10 AprW6YX 14083.9 31 dB RTTY45 bpsStanford, CA1182 km (734 miles) at 302.2 degrees***
2213z 10 AprW6BB 14083.9 18 dB RTTY45 bpsBerkeley, CA1213 km (754 miles) at 304.4 degrees***
1820z 09 AprWE9V 14083.8 15 dB RTTY45 bpsBristol, WI2309 km (1435 miles) at 53.7 degrees*******
1820z 09 AprK9LC 14083.9 16 dB RTTY45 bpsRockford, IL2227 km (1384 miles) at 53.7 degrees******
1819z 09 AprN6TV 14083.9 25 dB RTTY45 bpsSan Jose, CA1141 km (708 miles) at 302.1 degrees***
1819z 09 AprW6YX 14083.9 42 dB RTTY45 bpsStanford, CA1182 km (734 miles) at 302.2 degrees***
1819z 09 AprKE3BK 14083.9 30 dB RTTY45 bpsMountain House, CA1149 km (714 miles) at 305.3 degrees***
1819z 09 AprW6BB 14083.9 21 dB RTTY45 bpsBerkeley, CA1213 km (754 miles) at 304.4 degrees***
0513z 08 AprN6TV 7053.0 23 dB CW16 wpmSan Jose, CA1141 km (708 miles) at 302.1 degrees***
0513z 08 AprW3OA 7053.0 10 dB CW16 wpmMooresville, NC2774 km (1724 miles) at 74.1 degrees********
0513z 08 AprW6BB 7053.0 13 dB CW16 wpmBerkeley, CA1213 km (754 miles) at 304.4 degrees***
0513z 08 AprW8WTS 7053.0 22 dB CW16 wpmChagrin Falls, OH2813 km (1747 miles) at 60.3 degrees********
0513z 08 AprAC0C-1 7053.0 13 dB CW16 wpmLouisburg, KS1632 km (1014 miles) at 59.6 degrees*****
0513z 08 AprK9LC 7053.0 23 dB CW16 wpmRockford, IL2227 km (1384 miles) at 53.7 degrees******
0513z 08 AprVE6WZ 7052.8 22 dB CW16 wpmCalgary, AB2196 km (1364 miles) at 353.4 degrees******
0513z 08 AprWA7LNW 7053.0 28 dB CW16 wpmWashington, UT595 km (369 miles) at 337.3 degrees*
0513z 08 AprK9IMM 7053.0 25 dB CW16 wpmMount Horeb, WI2194 km (1363 miles) at 51.3 degrees******
0513z 08 AprK5EM 7053.0 17 dB CW16 wpmSeattle, WA1969 km (1224 miles) at 334 degrees******
0513z 08 AprW4KAZ 7053.0 12 dB CW16 wpmCary, NC2969 km (1845 miles) at 73.5 degrees*********
0513z 08 AprK6FOD