[Premium-Rx] Collins HF2050 99MHz Xtal Filter

[k5urg at yahoo.com]

Good luck to you! The 2050 is a great receiver!

-----Original Message-----
From: premium-rx-bounces at mailman.qth.net <premium-rx-bounces at mailman.qth.net> On Behalf Of William Schaffner via Premium-Rx
Sent: Thursday, April 16, 2026 4:55 PM
To: 'Mark Donaldson' <wa1qhq at yahoo.com>; premium-rx at mailman.qth.net; frledda at att.net
Subject: Re: [Premium-Rx] Collins HF2050 99MHz Xtal Filter

 Wow, Francesco, that is quite a difference!  I'm glad that you were able to find the problem and save the money.
I would like any of the receivers that TS has in stock but their prices do run a bit high...
BillKQ4O 
    On Thursday, April 16, 2026 at 08:35:56 AM CDT, Francesco Ledda via Premium-Rx <premium-rx at mailman.qth.net> wrote:  
 
 I had a failure on the A5 synthesizer board.  I called Toronto Surplus, as they have spare parts, but they wanted $850 for a checked synthesizer board.
Therefore, I decided to troubleshoot the radio.  Q13 had passed away.  It was a $5 fix.

SSL seems to have the filter in stock.
https://www.surplussales.com/items/118020/collins-filter/

Good luck with your HF2050.

Best, Francesco K5URG



-----Original Message-----
From: premium-rx-bounces at mailman.qth.net
<premium-rx-bounces at mailman.qth.net> On Behalf Of Mark Donaldson via Premium-Rx
Sent: Wednesday, April 15, 2026 5:35 PM
To: premium-rx at mailman.qth.net
Subject: [Premium-Rx] Collins HF2050 99MHz Xtal Filter

My Collins HF2050 receiver has never passed the self test that is initiated when the "Test" button is pressed, the fault is indicated to be in the A6 RF Translator Assembly. I finally got around to looking into this more carefully and found the gain through the translator was about 20dB low which explains the translator fault. Trouble shooting the translator, the faulty component was found to be the 99MHz Xtal filter.
Does anyone on the list have a spare 99MHz Xtal filter they can sell to me or better yet a whole A6 translator assembly. I know quite a few of these were demiled back about 20 years ago so perhaps some spares are available still. Everything else about the receiver is functioning correctly and I would really like to put it in operation in my station once I get it working properly.
Thanks,
Mark WA1QHQ
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