Of course, I meant the first IF was down converted to 85 KHz. 73 – Mike

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

From: Michael Kana <[email protected]>
Sent: Tuesday, June 18, 2024 10:37 PM
To: Mike Feher <[email protected]>
Cc: Tom Lee <[email protected]>; [email protected]
Subject: Re: [ARC5] Added detail re 1700kc xtal ask

Thanks for pointing that out. I found the schematics and saw the 1700kc xtal in the “2nd oscillator” so I could use one of those si5351 crystal substitute circuits in that role. 

As much as I want this to be all vintage I’m not so much a purist that I would hold back a build. 

I recall seeing the bc453 IF cans so now it makes sense. 

Luckily I have some spare IF cans in my parts box to dedicate to this project. 

It’s coincidental the other RX designs happened to have the 1700kc xtal as a filter. 

Thx 73

Mike

AA9IL

Warning!  This is transmitted over a non secure medium

On Jun 18, 2024, at 8:11 PM, Mike Feher <[email protected]> wrote:

I built the HBR-14 and 16 in the early 60’s. There was no crystal filter in those. The first IF was high and the second IF used 85 KHz IF transformers from an ARC-5 receiver, which could have adjustable BW by varying the separation between the primary and secondary coils. The 1700 KHz crystal was to down convert the second if to 85 KHz. 73 – Mike

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831