Sure, I would be glad to.....................when in the fast tune mode, you
can tune all the way down to zero kHz. From this point, you can tune
upwards, but you cannot tune down. This is how you can tune the radio to
15kHz. Since this is where you can hear the system noise floor rise because
of the phase noise from the synthesizer, you have a very good noise source
to perform the 1st mixer balance with. When adjusting the 1st mixer balance
pot, you have a very sharp null.

Pete

wrote in message
oups.com...
Quote:
The null is too broad to be of any use. Instead, tune the receiver
down to 15kHz

I thought the minimum frequency was 100khz??
Can you explain this?

Hi Pete

No, I am not one you sent the diodes to.

I just received the used receiver today and it sure has a lot of
birdies but I knew that when I bought it.

I have an MFJ-1024 active antenna but I did not use it yet. The
receiver schematic seems to indicate that there is DC on the antenna
connection.

I noticed in a post that you replaced capacitors in the audio chain and
front end. I am getting an order to Digi-Key ready and any suggestions
would be appreciated.

I just used some of the film caps that I had on hand for the audio chain. In
the front end, I used Silver Mica caps.


Yesterday I ordered from Alltronics.com a matched set of four
HP5082-2835 diodes. From a search I found out that these diodes are the
same as the 5711s.

A very good choice.

I have a function gen, Tek475 scope, frequency counter, dvm and analog
meter, HP wave analyzer, AD8307 RF meter, so calibration should not be
very difficult.

Tonight I will look at the schematic and your suggestions and
familiarize myself with the receiver.

Cheers

Richard


I think you will have fun with this receiver. Feel free to e-mail me
directly if you run into any snags. It is good to look at the addendum
sheet that is included with the manual. The specified PIN diodes, for
example, have been replaced with BA479 PIN diodes..........there are other
things as well. Instead of adjusting the tune voltage at the low end of each
VCO's tuning range for 3.5 volts, Ten-Tec now specifies 2.5 volts.
Have fun!

Pete