[VHFcontesting] Info/experience with TS790A and IC820H

Kenneth E. Harker kharker at cs.utexas.edu
Thu Aug 14 10:54:53 EDT 2003

On Thu, Aug 14, 2003 at 10:04:31AM -0400, John Hawkinson wrote:
> David Olean <k1whs at worldpath.net> wrote on Thu, 14 Aug 2003
> at 14:40:04 +0100 in <00d901c36269$92dcfc30$37c07f3f at DGL28221>:
> > Comparing a modern version DEM transverter and good modern HF radio with a
> > Yaesu 736 is like including Arnold Schwarzenegger and Pee Wee Herman in the
> > same class (humans).  Assuming that you are not a cheapskate, and get decent
> > coax, there is no need to tower mount preamps on 144 or even 222 with a DEM
> > transverter. A preamp will just kill your overload capability. If you have
> > to run more than 100 ft of coax, and it isn't 7/8" on the higher bands,
> > maybe a low gain preamp could help. Shoot for 1 dB feeder loss. 3 dB loss
> > starts to be real bad.
> Our experience at W1XM, high up in RF noisy Boston (albiet with a
> 736R), is that a preamp on 2 meters is incredibily valuable, even with
> an 80' run of heliax. However, it is necessary to front the preamp
> with a cavity filter. Remember, you can always turn the preamp off...

It's worth pointing out that N6TR is in a local environment where he is 
probably far less likely to find really strong nearby signals crunching
his receiver than someone operating on a hilltop in W1.  Which is something
to keep in mind when thinking about gear requirements.

Kenneth E. Harker      "Vox Clamantis in Deserto"      kharker at cs.utexas.edu
University of Texas at Austin                   Amateur Radio Callsign: WM5R
Department of the Computer Sciences          Central Texas DX & Contest Club
Taylor Hall TAY 2.124                         Maintainer of Linux on Laptops
Austin, TX 78712-1188 USA            http://www.cs.utexas.edu/users/kharker/

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