Yaesu FRG-7700 Survival Manual page 15

Communications receivers

Hide thumbs Also See for FRG-7700:

Change C94 and C95 (all 10nf) in 1nf, for a lower load of T09 and T10.

Remove R85 (4k7) for a better Q of T09.

If step 8 and 9 is done, you have to re-align T09 and T10 for maximum signal.

10)

Change C89, C101, C111 and C117 (all 10nf) to 560pf, to lessen the load on T08,T10, T11 and T12.

11)

Remove R65 (12k) to raise the Q of T05

12)

Remove R124 (10k) to raise the Q of T13.

It is possible to remove also R115 (10k), but the gain and noise of the 2

oscillations. So it is not recommended.

You can change the IF filters for better ones, a recommendation ( I did not change any):

CF01: CFW 455HT or CFG 455H, bandwidth 6khz

CF02: CFJ 455k6 or, much more expensive: Icom FL44A, 2.3 khz

CF03: CFS 455J, 3khz

CF04: CFS 455H6, 6 khz

13)

Change C164 (470 uF) to 47 uF, for a higher pitched audio.

Personally, i did not like the result, and changed this elco back to 150 uF.

14)

Solder a 330nf condenser parallel to C158 (100nf), for a better tone correction. Again, I did not like the result,

and changed C158 to 270nf.

This last part is a pure audio modification, and makes the audio somewhat higher, and gives a better SSB signal,

but for SW broadcast, the audio quality is good as is and need no changes.

PAØPGA

This is the resurrected FRG-7700 in my shack

IF will raise to high level, and can cause