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Sonar FS-2340

Posted: Mon Feb 12, 2018 5:52 pm
by 479tx
GF,

Ever widened up a Sonar FS-2340?

Was thinking fatten up the caps inside and put rack gear into the mic jack? What do you think?

Re: Sonar FS-2340

Posted: Mon Feb 12, 2018 8:20 pm
by 479tx

Re: Sonar FS-2340

Posted: Mon Feb 12, 2018 10:19 pm
by Goldfinger
Looks like it would be easier to inject after the clipper. I'll write up how tomorrow or the next day.

Re: Sonar FS-2340

Posted: Tue Feb 13, 2018 8:51 am
by 479tx
Thanks GF!

I just came into possession of a like-new FS-2340. Clipper board isn't even bypassed yet.

479tx

Re: Sonar FS-2340

Posted: Thu Feb 22, 2018 11:38 am
by Goldfinger
Disconnect the coax from points 105 and 106 on the clipper board output and direct inject the coax.
sonar 2340 clipper.jpg
sonar 2340 clipper.jpg (41.74 KiB) Viewed 495 times


Change C71 to a .22uF, 250 volt (or higher) disk, polyester or mylar.
Change C74 to a .22uF, 400 volt (or higher) disk, polyester or mylar.
Change C75 to a 10uF, 50 volt electrolytic, observe polarity

Changing these caps also widens the receive automatically. *bonus!* :mrgreen:

Re: Sonar FS-2340

Posted: Fri Feb 23, 2018 9:25 pm
by 479tx
Easy enough! Thanks a lot, Goldfinger. I'm going to give it a try this weekend assuming on-call with work is quiet.

Will let you know how I make out.

Re: Sonar FS-2340

Posted: Mon Feb 26, 2018 6:52 pm
by 479tx
Installed a 1/4" phono jack & did the wiring.

Just need to do the cap changes now.

Can I run the output of my rack gear straight into this without any kind of isolation?

Re: Sonar FS-2340

Posted: Tue Feb 27, 2018 3:18 pm
by Goldfinger
C71 should block any DC but if you want you could put a blocking cap at the jack. It's a fairly high impedance circuit so a 4.7uF should be plenty big.

Re: Sonar FS-2340

Posted: Thu Mar 22, 2018 6:25 pm
by ShadeTreeMechanic
I recently got a 2340 also. The clipper board has already been removed and bypassed. So I can just plug it into the mic jack, 10-4 8) Thanks!

WIN_20180216_132653.JPG
WIN_20180216_132653.JPG (174.93 KiB) Viewed 397 times