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

John Brier johnbrier at gmail.com
Tue Apr 4 17:05:31 UTC 2017


I almost suggested removing the Arrow diplexer if you had one and
connecting the radio or meeter directly to see if it was the antenna
or diplexer, but since you were using an 817 I figured you had two and
were operating full duplex without a diplexer.

73, John Brier KG4AKV

On Tue, Apr 4, 2017 at 12:44 PM, Ken Alexander <k.alexander at rogers.com> wrote:
> 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
> VE3HLS
>
>
> --------------------------------------------
> 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
>  Arrow.
>
>  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,
>
>  Ken
>  VE3HLS
>
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> _______________________________________________
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