[amsat-bb] Re: mode s converter
ve9qrp at gmail.com
Sun Jan 20 13:09:37 PST 2008
It's been a while since I've had my s-band equipment working, but as I
remember, an access point makes what appears to be an increase in the
noise level on a SSB/CW radio. (My linksys wifi router provides the
same service on all bands!) The nice thing about a signal generator is
that you have a single tone that you can hear with certainty, take
s-meter readings of, etc. When I had my downconverter and patch
antenna on my mast, I used to turn on the signal generator and point
the array at my shack, where I was holding the signal generator, as a
way of ensuring that everything was working.
Diane points out that calculating the frequency can be difficult. This
is true, but if you have an all-band radio, you can listen to the
harmonic of a 40 MHz can which should be up around 440 MHz. The error
will be multiplied 11 times, and you can use that to get a pretty good
idea of where the signal generator should appear in the s-band.
On Jan 20, 2008 4:24 PM, Stefano Simonetti <iw1rdz at yahoo.it> wrote:
> Thanks for the answers,
> I have here a 50MHz block, I will try, thank you, I already saw those
> projects at the ao40 days...Now finally I will make the circuit.
> I was also wondering if a wifi access point beacon would do the work.
> ISM band starts at 2400 and channel 1 is from 2401 to 2423 with the center
> of 2412.
> I tried but heard nothing, I don't know if there should be RF around
> 2401-2402 from an access point beacon tuned on channel 1.
> What do you think about?
> 73 - Steve - IW1RDZ
> ----- Messaggio originale -----
> Da: Diane Bruce <db at db.net>
> A: Bruce Robertson <ve9qrp at gmail.com>
> Cc: Stefano Simonetti <iw1rdz at yahoo.it>; AMSAT BB <amsat-bb at amsat.org>
> Inviato: Domenica 20 gennaio 2008, 20:29:32
> Oggetto: Re: [amsat-bb] Re: mode s converter
> On Sun, Jan 20, 2008 at 02:03:57PM -0400, Bruce Robertson wrote:
> > On Jan 20, 2008 12:44 PM, Stefano Simonetti <iw1rdz at yahoo.it> wrote:
> > > Hi to all, I would like to test my "old" AO40 13cm converter
> (2400-2402MHz) to see if it is still alive...
> > >
> > If you need a cheap-and-dirty signal source, try using one of those
> > small, canned RF oscillators at 40 MHz. Properly powered with a 5v
> > voltage regulator and a 9v battery, it will produce a harmonic signal
> > that you'll hear well from right next to the downconverter, and, with
> It works a treat. There is a design using a filter
> here: http://www.g4dmf.co.uk/2400/2400.html I've not gotten around
> to building it.
> > a gain antenna, from some distance away. Don't worry about building it
> > an antenna. If you're not sure if what you're hearing is the sig gen.
> > or a birdie, just blow on the sig gen, and its frequency will warp!
> The problem with the xtal module is which harmonic are you listening to?
> It's good enough for tweaking your converter and making sure things work,
> but it's not going to reliable to use as a frequency standard. ;-)
> > At $2, it was all I used to hack and tweak my downconverter. I got
> > this idea from a VE2 ham's webpages, but I can't seem to google them
> > up right now.
> I took one off an old 386sx board; Just about any old
> xtal module will multiply up into 2.4.
> - 73 Diane VA3DB
> - db at FreeBSD.org db at db.net http://www.db.net/~db
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