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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