Dale Farnsworth (call sign unknown) posted on Monday that the Mouser
part number for the more robust version is 771-BAP64-04-T/R . Maybe you
missed it. Mouser has over 4000 in stock at a price of $0.38, or 10 for
$3.10.
Glad you found the problem. It's a relatively easy fix.
Dave
Dave... thanks so much. The sensitivity returned when I did the J66
jumper test. So looks like PIN diode D5 needs to be replaced. Looks like
I can order from Mouser. Will do some digging and see if I can find the
"more robust version".
73, Connie / K5CM
On 7/19/2021 12:08 AM, David
John, KK9A is absolutely correct: without
external bandpass filters, the replacement
of PIN diodes in the T/R switches, even with
more robust replacement devices, may not
prevent the burnout from re-occurring.
The K3/K3s lowpass filter for 15/17 meters would
offer virtually no attenuation of a
You should also fix the cause of the high level of RF. Did you use band
pass filters?
John KK9A
Connie Marshall k5cm wrote:
While operating SO2R the 'HIGH RF" warning flashed on the K3 display.
Before I could react and stop the transmission on the other radio the
front end got zapped. The
Try this:
https://marc.info/?l=elecraft=145323127930319=2
Unfortunately, the link near the bottom for the more robust replacement
part doesn't work anymore, but maybe someone can come up with the part
number. I've got a bunch of them at home, but I'm on vacation. The
robust replacement is
While operating SO2R the 'HIGH RF" warning flashed on the K3 display.
Before I could react and stop the transmission on the other radio the
front end got zapped. The radio is down about 50 db on RX. I checked Ant
2 and RX antenna and the same problem so probably not the surge
protectors on
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