[amsat-bb] Problems with my Arrow - Thank You!

Ken Alexander k.alexander at rogers.com
Tue Apr 4 16:44:46 UTC 2017

Hi folks,

The grid expedition to FO00 is over, and it was a success despite the technical problems I was experiencing.  

Many months ago, in my satellite infancy, I removed the stock diplexer from my Arrow antenna and replaced it with a Comet (or Diamond?) diplexer.  The commercial diplexer was built in a heavy cast cabinet and used SO-239 connectors.  It was big and heavy, so I took it apart and installed it in a small Hammond diecast aluminum cabinet with BNC connectors.  Much smaller and lighter.  I attached it to the Arrow's boom it worked like a charm up until last weekend.

Late Saturday night, while struggling in the dark to connect a cable to the diplexer I noticed that one of the female BNCs on the cabinet kept spinning as I attempted to lock the cable into place.  Eureka!

I opened up the diplexer cabinet later that night and found that while the center conductor connection was still solid, the ground/shield connection was shaky at best.  I tightened it as best as I could and the problem went away!

I want to thank you all for the many helpful responses.  I read all of them carefully and followed all of the suggestions, to the extent that I could...800 km from home and with only a Swiss Army knife and needlenose pliers with me.

73 and thank you again!

Ken Alexander

On Fri, 3/31/17, Ken Alexander <k.alexander at rogers.com> wrote:

 Subject: [amsat-bb] Problems with my Arrow
 To: amsat-bb at amsat.org
 Date: Friday, March 31, 2017, 8:24 PM
 I just checked the SWR using my
 FT-817ND's built in meter.  I connected 
 directly from the 817 to the appropriate connector on the
 At 435 MHz the SWR meter shows 5 bars, which doesn't sound
 good to me.
 At 145 MHz I get a very brief indication of 6(?) bars and
 then the the 
 bars immediately disappear.  This sounds to me like a
 protection circuit 
 engaging, and subsequent presses of the mic button produces
 no output.  
 It also explains why I practically never get into SO-50.
 The FT-817 manual is silent on the meaning of the bars on
 the SWR 
 meter.  Does anybody have an knowledge of the 817's SWR
 meter that they 
 could pass along to me?  Any assistance would be very
 gratefully received!
 Many thanks in advance,
 Sent via AMSAT-BB at amsat.org.
 AMSAT-NA makes this open forum available
 to all interested persons worldwide without requiring
 membership. Opinions expressed
 are solely those of the author, and do not reflect the
 official views of AMSAT-NA.
 Not an AMSAT-NA member? Join now to support the amateur
 satellite program!
 Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list