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Re: U band getting into S band



I had the same problem until I added a 70cm 4-pole bandpass filter from DCI
(purchased from HRO for $109) to my uplink.  Worked like a champ and also
eliminated some intermod I was experiencing on part of the 70cm band.

Rick - KG6IAL

----- Original Message -----
From: "Steve" <jepsen_st@mindspring.com>
To: <amsat-bb@AMSAT.Org>
Sent: Thursday, February 28, 2002 7:57 AM
Subject: RE: [amsat-bb] U band getting into S band


> Hi Jeff,
>
> I didn't see any answers to your post so I thought I'd chime in.
> There's been some discussion on the BB about using 'quarter
> wave matching stubs as bandpass/rejection filters. I've used this
> trick for the FO sats and it works. You might look back through the
> archives and see if you can find the thread. The subject is also
> covered in the old 'arrl antenna handbook'. (I only know about the old
> one)
> You might also just try changing the polarization of your BBQ
> antenna. It probably won't work but it's easy so it's worth a try.
>
> Steve..AI7W
>
>
> -----Original Message-----
> From: owner-AMSAT-BB@amsat.org [mailto:owner-AMSAT-BB@amsat.org]On
> Behalf Of Jeff Hite
> Sent: Wednesday, February 27, 2002 00:30
> To: amsat-bb@amsat.org
> Subject: [amsat-bb] U band getting into S band
>
>
> I have just finished assembling a mode U/S station and tried some CW
> transmissions for testing purposes. I am hearing my 70cm signal directly
on
> the 13cm receive. This is a Norsat 2500 fed from a BBQ dish via a DEMI
> 13ulna. I have successfully decoded beacon telemetry when the squint is
> reasonable, so I would assume the receive side is doing OK. The uplink
> antenna is an 11 element M2 yagi that had ~20 watts input. The antennas
are
> approximately 4 feet apart on a PVC "T", mounted in a tripod. The power
for
> the D/C and LNA are fed on the RG-6 receive feed line.
>
> Any suggestions on where to start troubleshooting?
>
> Thanks,
>
> Jeff Hite
> KK7WR
> jeffh@oregon.uoregon.edu
>
>
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