Re: [IRCA] El Cajon, CA ULR TP 2011-03-16 - audio on 1566, help w/ID?
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Re: [IRCA] El Cajon, CA ULR TP 2011-03-16 - audio on 1566, help w/ID?





17.3.2011 13:37, Stephen Airy wrote:

I don't know how weak a signal you want Stephen, but many of the inexpensive radios (pretty much all made before the advent of the DSP ultralights) broadcast a good local oscillator signal at 450 or 455kHz above the frequency indicated on the radio dial. If you have such a radio with an accurate digital display, then you can use that as your oscillator, simply adding 450 or 455 kHz to the indicated display.

Nick

As for generating a weak signal on/near target frequencies to aid in finding TPs, does anyone know of an inexpensive (the lower the better even if I have to buy used - prefer that it be considerably cheaper than the PL-606), portable (battery-powered& small but doesn't have to be pocket size) device I could use that would be better suited for uses like that (coverage from at least 150kHz to 1.8 MHz, up to 22 MHz is a bonus, also strong enough to hit a solid 98/25 on the PL-606's RSSI/SNR display when within about a foot of it, and an RF gain control for when I need less power)? Ability to plug in an audio source and transmit that over short range (maybe a hundred feet - for other testing purposes) would be a nice bonus, or even modulating the carrier with a tone whose frequency could be set by the user (when chasing TPs, though, it would only transmit an unmodulated carrier).

(There's a few other things I wanted to ask about, but this post is getting longer than I would like (even though it only takes a small portion of the screen when running full screen at 1920x1440 and browser zoom at about 70%), so I'll save those for another post sometime.)

73,
Stephen
El Cajon, CA - Grid DM12MS, SE quadrant ; within 1 mi of 32°45'40"N 116°56'50"W




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