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Re: 1.2ghz options



John
Do both of the parts sources have pin diodes, too? And, what do look for in a
pin diode?
Don...W6RWN

"John Stephensen, KD6OZH" wrote:

> I did something similar a few years ago. The DEMI weak signal source can be
> used to generate the LO. It has lower spurs if you multiply crystal
> frequency by an odd number and use back to back PIN diodes for the
> multiplier. RF Parts and Surplus Sales of Nebraska have MiniCircuits mixers
> available cheaply and the ARRL Microwave Handbook has design information for
> interdigital filters that can be built from brass tubing and sheets from the
> hobby store.
>
> 73,
>
> John
> KD6OZH
>
> ----- Original Message -----
> From: "Mike Kana" <cosmo224@execpc.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Friday, 02 February 2001 02:49 UTC
> Subject: [amsat-bb] 1.2ghz options
>
> > Howdy all
> >
> > Ok, here are some random musings to get on 1269MHz.  A homebrew route
> > would be build up a transverter from surplus.  A good source (pun
> > intended...)
> > for an LO would be to take a California Microwave or Frequency West
> > brick
> > oscillator who's pre-srd frequency would tune in the range of 1269 -/+
> > the IF.
> > (Remember that high side injection flips the tuning and sidebands).  The
> > mixer,
> > and first gain stages could be realized by using a Minicircuits mixer
> > and surplus
> > 1 to 1.5 Ghz gain stages.  The filters could be interdigital types using
> > plans from
> > the RSGB microwave manual or hair pin filters.  Curious what type of
> > pipe cap
> > would be needed to build a simple single stage filter?
> >
> > The 'high power' stage would be a DEMI kit to get to the 3 watt range.
> > This
> > could drive another gain block then feed a 2C39 cavity amp (designs from
> > the
> > Handbook)
> >
> > Another thought would be to use a DEMI 1296 weak signal source
> > recrystaled
> > to tune to 1269 for a CW only rig driving one of the 'pod' amps?  (Has
> > anyone
> > successfuly got one of those running?)
> >
> > Finally, here is the long way to get there.  Use a HF rig running 21.15
> > MHz driving
> > multipliers (varactor or otherwise....) to generate the 1269 signal
> > (1269/60 = 21.15).
> >
> > Ok, there are some quick and dirty ways to get a mode L signal.  Any
> > other thoughts?
> >
> > 73 de AA9IL
> > Mike Kana
> >
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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