[amsat-bb] Re: mode s converter

Stefano Simonetti iw1rdz at yahoo.it
Sun Jan 20 12:24:51 PST 2008

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

L'email della prossima generazione? Puoi averla con la nuova Yahoo! Mail: 

More information about the AMSAT-BB mailing list