Hi MAc,

Can you give more examples of what you mean by "manual IF control", I
don't understand what you want to do.

Do you want to:
- Adjust overall dynamic range ?
- Adjust centre frequency ?
- Keep current dynamic range, but apply an offset ?
- etc

Do you have an English translation of your paper ? it looks most
interesting.

Regards,

Mark

On Jun 11, 11:12 pm, MAc wrote:
Hi All

Idea
IF amp. 9MHz - single ad600 working in sequential mode, AGC realized
with AD8307 and opamp (http://www.mydarc.de/dc4ku/S_Meter.pdf-
bild1)
control voltage for AGC realized with TL431 similar to cdg2000.

Problems
1. - find a simplest way to implement a manual IF control. ("manual"
does NOT mean turning off AGC but possibility to change amplification)

How? Change a control voltage? add a manual regulated stage??? How to
realize threshold?

2. How to changing a time constant of AGC

Any directions or ideas? (www?)

73
MAc