[amsat-bb] Re: Landwehr 2m Preamp Help/Info & Manual Request

Vince Fiscus, KB7ADL vlfiscus at mcn.net
Mon Oct 8 07:57:32 PDT 2007

At 01:29 PM 10/7/07 -0400, dpapay at chartermi.net wrote:
>I recently obtained a Landwehr 2m preamp which I plan to use for AO-7
>operation.  The preamp did not come with any significant
>documentation besides what is printed on the cover (and thats a bit faded).
>The preamp appears to be functional, except that it has a tendency to
>switch back and forth between RX and TX by itself (when no RF is
>present and the PTT is not connected).  This has made the preamp
>unusable.  Does anyone have experience with this preamp and/or know
>how this issue can be resolved?
>I am looking for any suggestions as well as any documentation
>(manual/schematic) for this preamp that you might have.  Your help is
>Thanks & 73,
>Doug, KD8CAO

I have both the two meter and 70cm Landwehr preamps and the documentation 
for them.  The only problem I've ever had is with the two meter preamp.  I 
get desense on mode J whenever it's in line. So I leave it on the self in 
the shack.  I really don't need it until we get another P3 bird or 
something else that has a weak two meter downlink.

If you don't get a copy of the docs I'll scan and email it to you.  Just 
email me and let me know.


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