Pro-2004: Signal level meter circuit

[videobruce]

I found this closed thread regarding using 2 germanium diodes & 2 ceramic caps used to produce a voltage for a signal level meter;

Pro-2042 signal strength meter mod

The Pro-2035 and 2042 were great scanners, and continue to be useful for aircraft monitoring among other things. They, like their predecessors, ( 2004,5,6 ) fell short in a few areas. One of those was not having a way to visualize the relative strength of the incoming signals. Enter Bill Cheek (...

forums.radioreference.com

The problem is I don't know the exact diode numbers used since no one in that tread showed it in any post other than a photo which doesn't help.

The point I used on two different 2004's was TP5 inside the shielded compartment towards the front of the unit, which I have to figure was Bill Cheeks circuit.


I want to do the same thing on a 2006, but the only SS meter circuit I found is using D33 via a 10k resistor and a ceramic cap to ground which DIDN'T work! (All I got was a 1.5v negative voltage with a signal received.)

 

[videobruce]

So, the other question, will that circuit work on a 2006? And where is the tie in point?

 

[wscranston]

Not sure if you have this but: http://www.wentztech.com/radio/resources/Equipment-Mods/_Pro-2006-Mods/Pro-2006-S-METER-MOD.TXT

I remember in one of Bill Cheek's books he described a mod where he put a row of tiny LED's above the display and used them for the S-meter display.

 

[videobruce]

You mean like this;



I did two of them, the 1st I sold which I wished I kept.

 

[N1SQB]

Hi Guys, today is your lucky day. I am currently modifying my Pro-2006 using my Bill Cheel mod books. Now then, the parts needed for the signal meter mod are as follows :

Capacitors: (2 X)- 0.01uF/50 VDC
Diodes: (2 X)- Germanium 1N34A type

Tap Points:
D33 next to TP2 (2005/6)
TP5 (2004)

Manny

 

[videobruce]

That was in wscranston's link above mine.