Discussing Pin Diodes in RF amplifiers
The problem of obtaining in my earlier post was for the Alpha 89 for a friend.
I own one and a friend WW4US owns the failed unit.
We were researching the problem this weekend before Crosslink opened. Since
then Crosslink is shipping the needed KS1001 pin diodes.
Please do not address some of the below suggestions about how it may be absurd.
Be constructive.
The suggestions have been listed as hams this weekend offered them up.
New questions:
* What can one do to protect RF Amps using pin Diodes?
Suggestions and Solutions to date from on the air hams:
I. Addressing static discharge
A . Install High value resistor across amp output i.e.
300K
B. Provide a antenna with DC ground path. i.e. loop
antennas, dipole
with coaxial stub., and high impedance choke to antenna.
C. Alpha has a gas discharge arrestor right at the
output connector. Is this adequate and
what level of static discharge protection does this provide?
D. Short coax to gnd after reconnecting to amp after
being disconnected.
2. High SWR
A. Self explanatory
3. Install more rugged Pin Diodes.
A. All Internet searches vague on what to replace the KS
1001 with.
B. Manufacturers sources for replacements for the KS 1001
C. Are the KS 1001 Pin Diodes used in Alpha amps still
in production and
who is the manufacturer?
4. Check and Modify pin diode sequencing circuit.
A. Change the Value of the factory fuse in the pin diode
circuit on the
alpha pin diode amps.
KB4TCU
Victor Vickers
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