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You are better off just replacing the board. The transistors
tend to be more expensive than a replacement PA and board replacement is easier
anyway. You can likely pick up a complete mobile radio for less than the
transistors.
Chuck
WB2EDV
----- Original Message -----
Sent: Tuesday, June 07, 2005 3:59
PM
Subject: Re: [Repeater-Builder] Mastr@
Base 2 mtr pwr amp failure need help
Eric and Lee, >Re VHF amp failure.
Thank you both for your fine suggestions. Almost fixed. The
junction between the PA and output filter board was broken. This was repaired.
The Astron bench supply does crowbar at 80 RF watts output at 19 amps,
(too high) Running the RF amp at 70 watts produces one hot and one
cold output transistor. All high power joints were resoldered, hoping it was
an expansion crack. Zipp. PA transistor on right side is cold. The
number is ACRIAN 4387P1 842141467. I know it should be a matched pair but at
this point I might take a chance. Anyone have a beatup amp for parts or a
replacement transistor they would be willing to sell me? Man I hate
charity jobs. They always cost me money. You guys ever notice that or is it
just me?
Thank you gentlemen,
Gary K2UQ
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- Re: [Repeater-Builder] Mastr@ Base 2 mtr pwr amp failure need... Chuck Kelsey
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