[amsat-bb] Falling Arrow

[Robert McGwier]

Pull everything out of line of an individual antenna and its feedpoint.
Take a known good piece of coax, attach it to one of the bands (2 or 70 cm)
and see if the results improve.  Work backward from there to isolate which
component is having a problem.  But if both bands are not working, you
already know there is a problem in a common component (diplexer or shared
coax from diplexer to radio).

Bob
N4HY


On Tue, Jan 2, 2018 at 6:19 PM, John, 9H5G <kk4oyj at gmail.com> wrote:

> I’ve become aware that my Arrow may be failing. I’m less and less able to
> hear the birds towards LOS and sometimes it’s taking the 1st 1/4 of an FM
> pass to hear anything typically more than 30 degrees elevation.
>
> I know there are many of you working at much lower elevations so I’m
> beginning to think I have a problem. It’s a salty environment here in C6
> and there a little corrosion here and there. Sadly, I have no antenna
> analyser with me for UHF or VHF. I’ve already stripped it down once and
> cleaned everything so any advice on the following gratefully received:
>
> What elevations is it reasonable to hear each FM sat using a THD-72
> (listening VFO A). What other places might I look for reduced performance?
>
> Thx and 73
>
> de John, C6ATS
>
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-- 
Bob McGwier
Founder, Federated Wireless, Inc
Founder and Technical Advisor, HawkEye 360, Inc
Research Professor Virginia Tech
Chief Scientist:  The Ted and Karyn Hume Center for National Security and
Technology
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
Director of AMSAT
Member of PVRC (Roanoke-Blacksburg), TAPR,  life member of ARRL and AMSAT,
NRVR.ORG (Rocketry)