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deaf Astro

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k9wkj

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Feb 18, 2015
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where they make the cheese
my hi power vhf Astro has come up slightly deaf
it has the HRD6002G preselector/preamp/mixer board in it
im tossing darts here but seeing as the voltage from the rf board to feed the preamp is good (9.38v) and its recieving on frequency (the mixer and vco must be working)
so im guessing that something has happend to the transistors in the preamp

Q3202 4802000P02 NEC SILICON TR 2SC3357
Mouser has that one on the shelf

Q3200 4880141L01 TSTR PNP SOT23
Q3201 4880141L01 TSTR PNP SOT23
but im not finding the other 2 that part# doesnt resolve to well for me

or maybe
CR3200 &
CR3201
4880154K03 DIODE DUAL SCHOTTKY MIXER

did they put that diode package across the input to protect the circuit?
i wonder if that got popped and is dragging the frontend down?
i found those by the Moto part # but seems spendy

any ideas?
am i hopelessly stupid?
 
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k9wkj

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Feb 18, 2015
Messages
306
Location
where they make the cheese
hey!
ohh I have the detailed and basic service manuals
im lacking a signal generator and a rf millivolt meter (well okay im lacking sanity and basic understanding as well)
and I have been hanging around repeater builder for years
its a T04KLH9PW9AN so 110watt W9 146-174 mhz with 1 meg vocon but it doesnt have the digital firmware.

was hoping someone could point me down the right path ie: have seen this before


de k9wkj
 

cmdrwill

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Mar 30, 2005
Messages
3,302
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So Cali
We fix those here. Most of the time it IS due to some other transmitter antenna being too close to the Spectra's antenna.

Mouser 551-NE85634A is what you need. Replaces the Q3202 4802000P02 NEC SILICON TR 2SC3357
 

k9wkj

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Feb 18, 2015
Messages
306
Location
where they make the cheese
cool!
wonder if that 110 watt lowband Maratrac with its antenna antenna on then other end of the van roof did it :mad: and what sort of measures i can take to protect the Astro

so that leaves me left wondering about those diode packages i cant get those to cross
looks to be just a normal series pair
but i have no clue as to parameters :confused:
 
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