In article
,
David wrote:

I connected it to my SB-301 receiver by tapping the secondary of
its last intermediate frequency (IF) transformer (T4 in the 301's
schematic) using a 1pf capacitor

Dave-

What do you mean by "tapping"? If you did not connect the 1pf capacitor
to the top of the coil, then that may be causing your reduced signal.

Fred
K4DII

On Dec 25, 12:43*pm, Fred McKenzie wrote:
In article
,

*David wrote:

I connected it to my SB-301 receiver by tapping the secondary of

its last intermediate frequency (IF) transformer (T4 in the 301's
schematic) using a 1pf capacitor

Dave-

What do you mean by "tapping"? *If you did not connect the 1pf capacitor
to the top of the coil, then that may be causing your reduced signal.

Fred
K4DII

Fred,

Sorry for using misleading terminology. I did just what you suggest--
I connected the 1pF cap to the top of the IF transformer's secondary
coil.

-Dave Drumheller, K3WQ

In article
,
David wrote:

I did just what you suggest--
I connected the 1pF cap to the top of the IF transformer's secondary
coil.

David-

Might the signal level be higher on the primary side, assuming the 1pf
capacitor can withstand the voltage?

Fred
K4DII

On Dec 26, 11:39*am, Fred McKenzie wrote:
In article
,

*David wrote:
I did just what you suggest--
I connected the 1pF cap to the top of the IF transformer's secondary
coil.

David-

Might the signal level be higher on the primary side, assuming the 1pf
capacitor can withstand the voltage?

Fred
K4DII

Fred,

That might very well be the case. I can go in with my o'scope and
see.

Thanks for the tip.

-Dave

Well, I fixed the problem.

My homemade coils/filters are OK. Using a signal generator, I applied
a 0.5 Vrms signal to the SB-610’s vertical amplifier input and got a
trace on the CRT that was about 1 inch high (thick), which meets the
specifications at 3.395 Mhz.

The problem was the 1 pf capacitor I used to couple the plate circuit
of the SB-301’s second IF amplifier to the SB-610. I raised this cap
to 6 pf and now have plenty of signal for the SB-610.

Thanks for all the advice. It saved time.

-Dave Drumheller, K3WQ