[Amps] Alpha 87A Won't Transmit

[gudguyham]

It’s nearly impossible to get a good solder connection on foam type coax.  To do a good soldered pl259 you need to run the braid well so that soldering it to the shell makes a good connection to the braid.  You’ll melt any foam when trying to probably tin the braid.  However on poly type center conductor that can withstand the heat required to tin the braid you can effectively do a soldered connection to that type of coax and many hams like poly because it can be soldered.  When I encounter foam coax I do crimp the braid but still solder the center conductor.  


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On Thursday, April 8, 2021, 9:45 AM, MU 4CX250B <4cx250b at miamioh.edu> wrote:

Thanks, Rob, that’s a very informative link. After years Of arguing
against crimp connectors, I’ve finally been persuaded to change my
mind. What did the trick are the “next generation” PL259 connectors
sold by DX Engineering. I am gradually converting the hundred or so
PL259 connectors in my station over to this design. The DXE connectors
are a hybrid design that crimps the coax braid, but retains soldering
for the center pin connection. Although they require a relatively
expensive crimping tool, they can be installed in half the time as
other connectors, and are virtually foolproof.
73,
Jim W8ZR

Sent from my iPhone

> On Apr 8, 2021, at 4:45 AM, Rob Atkinson <ranchorobbo at gmail.com> wrote:
>
> 
>>
>> In my experience, UHF connectors, especially spices, often develop
>> corrosion and intermittent connections on the inner conductor. I’ve
>> discovered that if I undo a PL259 and look at the mating S0239, I can
>> clean a lot of carbonized goop out of the hole.
>
> In my experience the problem is crappy off shore UHF females with pin
> cups that don't tightly grip the male center.  Read this:
>
> https://forums.qrz.com/index.php?threads/a-rogues-gallery-of-panel-mount-uhf-jacks.735574/
>
> 73
> Rob
> K5UJ
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