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Re: [Amps] Alpha 87a Low receive

To: Jerry <jsternmd@att.net>, amps@contesting.com
Subject: Re: [Amps] Alpha 87a Low receive
From: Robert Arenella <rja12@comcast.net>
Date: Tue, 14 Jun 2016 01:03:02 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
On 6/13/2016 6:03 PM, Jerry wrote:
The TX and RX pin diodes have been remarkably reliable with infrequent
failure.
  I'll stick with my statement that pin diodes were / are the Achilles 
Heel of all the Alpha Amps that used them, especially the 86. If they 
were so reliable, why did Alpha design & build a replacement T/R board 
for the 86 that used vacuum relay switching?  Why did 86 owners buy 
EVERY ONE that Alpha made?  They were not cheap, about $450 each.
  The pair of those Tx pins could handle about 20 watts of reflected 
power.  My 86 trips at about 2:1 SWR.  Do the math.  At the legal limit, 
that's WAY more than 20 watts of reflected power.  P-O-O-F!

73,
Bob
N2OAM
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