Just one data point, but I had an 86 for at least a year, used it
heavily and the PIN diodes were fine. I am sure I accidentally
transmitted into the wrong antenna several times. I did have a pretty
good lightning protection setup with multiple ground rods and ICE
protectors that provided a DC ground path for static, so maybe that
helped protect them.
73,
Vic, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 14 Jun 2016 08:03, Robert Arenella wrote:
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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