Sonar FS-2340

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479tx
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Sonar FS-2340

Postby 479tx » Mon Feb 12, 2018 5:52 pm

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?
479tx
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Re: Sonar FS-2340

Postby 479tx » Mon Feb 12, 2018 8:20 pm

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Goldfinger
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Re: Sonar FS-2340

Postby Goldfinger » Mon Feb 12, 2018 10:19 pm

Looks like it would be easier to inject after the clipper. I'll write up how tomorrow or the next day.
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479tx
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Re: Sonar FS-2340

Postby 479tx » Tue Feb 13, 2018 8:51 am

Thanks GF!

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

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Re: Sonar FS-2340

Postby Goldfinger » Thu Feb 22, 2018 11:38 am

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 488 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:
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479tx
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Re: Sonar FS-2340

Postby 479tx » Fri Feb 23, 2018 9:25 pm

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.
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Re: Sonar FS-2340

Postby 479tx » Mon Feb 26, 2018 6:52 pm

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?
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Re: Sonar FS-2340

Postby Goldfinger » Tue Feb 27, 2018 3:18 pm

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.
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ShadeTreeMechanic
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Re: Sonar FS-2340

Postby ShadeTreeMechanic » Thu Mar 22, 2018 6:25 pm

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!

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