HFU HF Underground
Loggings => North American Shortwave Pirate => Topic started by: ChrisSmolinski on June 04, 2018, 2324 UTC
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About an S5 / SIO 333 here at 2324.
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Just a weak carrier here at 2325 UTC....no audio noted
2341 UTC Just had a brief fade up of music! First audio detected so far :)
2343 UTC "What Do You Want From Life"-The Tubes (About 2 minutes of audio peaking at S5!)
2349 UTC OM talking now...mention of 30 minutes, into a singing Miller High Life commercial!
2350 UTC Signal just jumped up to S7...power increase or prop? "Dust My Broom"-Elmore James
2353 UTC "Money Trouble and Love"-Hank Thompson
(Signal faded deep into the noise at 2356 UTC...still have a weak carrier)
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2328 The Doors. / five to one long fades S3
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Relay Station 6880 AM S7 in NY
2355: Hank Thompson “Money Trouble And Love”
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Hearing some music coming in but most of the time it is in the mud at 00:38UTC! Very poor will see if it improves!
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0102 UTC - Music playing but signal is down in the noise.
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A very nice SIO 444 signal at 0945 UTC, break in the carrier around 0953, then back on with an open carrier.
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good morning to you Chris and all the respected HFU members.
i did some work on the TX and amplifier early this morning.
added a secondary 7Mhz LPF in series with the first 7Mhz LPF on the IF pre-amp output to further attenuate the second harmonic.
reworked pin 5 of IC SN169136P low level balanced modulator/RF mixer.
the amp grid current and plate current was also re-adjusted (now at 1KW RMS with 700mA plate and 250mA grid)
the amp input pi-tank was also re-adjusted for minimum VSWR at 1.2.
with this simple IC, anyone can generate full spectrum audio AM low level modulation.
simply input an RF input signal to pin 2 - audio input to pin 5 with DC bias to control carrier level with pull down resistor and DC coupling capacitor - AM RF out on pin 1.
if the DC bias is "zeroed" (balanced), you get DSB.
https://www.datasheetq.com/contents-image1/Texas-Instruments/882033-DI1.gif
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1220z June 5th Hearing you S9 20 + on a mid-Atlantic SDR. Sounding very nice.
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After dropping out, the signal has come back up. S9+10 according to the (probably not accurate) NRD 545 S meter, but it sounds great. I have the bandiwdth opened to +/-6 k kHz and am feeding the audio to the Fender amp.
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thanks guys !
but its going to be the "temporary" band conditions as i predict sometime between 1400Z - 1600Z, the conditions wont be favorable any longer - im at the usual 50W (10Khz audio).
i was quite surprised to see the sweep go to 20Khz on the spectrum and see 20Hz very prominent as well - looks like the re-work i did on the TX worked out very well.
y'all have yourselves an excellent day today, ill be playing fascinating wonderful oldies for the better part of the day while i stability test everything ;)
edit 1:
back down to 1 watt for 24/7 operation for the remainder of the week.