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adding a Signal strength meter

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Post by Resistance is Futile on Mon Dec 17, 2012 5:51 pm

I am quoting from the radio amateurs handbook 1968 pg 110:
The simplest tuning indicator is a milliammeter connected in the d.c. plate lead of an a.g.c. controlled r.f. or i.f. stage. Since the plate current is reduced as the a.g.c. becomes higher with a strong signal, the plate current is the measure of the signal strength.

The meter can have a 0-1,0-2 or 0-5 ma. movement and it should be shunted by a 25-ohm rheostat which is used to set the no-signal reading to full scale on the meter.
If a forward reading meter is desired, the meter can be mounted upside down.
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Post by N7ZAL on Mon Dec 17, 2012 5:53 pm

Something blew up here, Cliff. I tried responding and until you answered, the post was off limits. I now see your post but all the previous ones are gone????
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Post by Resistance is Futile on Mon Dec 17, 2012 6:01 pm

oops My mistake and I just tried to delete my topic but instead deleted the whole thing. I wondered why I couldn't find it. There is no back button or undo button either. Embarassed
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Post by N7ZAL on Mon Dec 17, 2012 6:10 pm

It happens. Hopefully the OP will re-post. I was just getting confused because I was going to respond and the thread was gone. Also, wasn't his post in another area? Just curious, so I can watch for his re-posting.

Anyway, we have information on S-meters. Wink
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Post by lucianopep on Tue Dec 18, 2012 11:10 am

ahh! :-) ok no problem repeat again the link whit photo and schematic diagram.-) Thanks luciano

http://albums.photoonweb.com/l/luciano61/RX_Tubes_ssb_/

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Post by N7ZAL on Tue Dec 18, 2012 12:10 pm

Glad we are back on track. Very Happy

The pictures document a well detailed account of your build. Good construction techniques.

As Cliff posted, that is the general approach to the s meters. If you have the ARRL Radio Amateurs handbook that you got the receiver schematic from, look up "S" meters for details. I checked my 1944 Handbook and they had discussions and explanations in there. I'd stay away from a solid state/tube hybrid for the meter.

Welcome back. Wink
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Post by lucianopep on Wed Dec 19, 2012 10:14 am

hello Bill! Hello Cliff..in this moment work this circuit s meter ..(sig..solid state)

http://www.flickr.com/photos/90909458@N02/8287960498/in/photostream

it's connect on "in" filter collins 455 :-)

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Post by N7ZAL on Wed Dec 19, 2012 12:20 pm

The base and collector of the transistor fluctuate/change with the audio??
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Post by lucianopep on Wed Dec 19, 2012 1:13 pm

hello! No ..the s'meter is no fluctuate whit audio bat whit signal receiver..bat ..is not very sensitive :-(

this circuit is t connect pin 5 6ba6 (pin filter collins)

up CAV (AVC) ...no work!

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Post by N7ZAL on Wed Dec 19, 2012 4:22 pm

I'm not familiar with that IC, but looking at the spec sheet it appears it was design around a 10.7 MHZ IF. Did you design the circuit? Might want to go with the approach Cliff mentioned. If you have an old handbook, say 1959, there should be information on S meter circuits. (might have already mentioned this, but posts were deleted).
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Post by lucianopep on Wed Dec 19, 2012 5:09 pm

ok Bill! I did .. (there are 3 different pregetti change that) I also tried the 12AU7 but it was not very sensitive too.

http://www.ardf.info/tecnica/ic2ti2xjw/ic2t/S'meter-455Kc.jpg

I found this pattern .. and I installed a "spider web"! Perfect ..! Antenna disconnected the instrument is still zero. Ssb signals are handled by the circuit, and then by strument perfectly.
Now I'll just make 'PCB. Bill .. Thanks! I'll send 'early video of the work done :-)

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Post by N7ZAL on Wed Dec 19, 2012 7:04 pm

Great and post the results !
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Post by lucianopep on Thu Dec 20, 2012 1:40 pm


hello, this is S'meter ..

http://www.flickr.com/photos/90909458@N02/8291895152/in/photostream/

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Post by lucianopep on Thu Dec 20, 2012 1:43 pm



and .. the video

http://www.flickr.com/photos/90909458@N02/8291957600/in/photostream

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Post by N7ZAL on Thu Dec 20, 2012 3:15 pm

Excellent and it seems to work fine! Congratulations.
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Post by lucianopep on Thu Dec 20, 2012 3:33 pm

thanks Bill! :-)

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Post by Bill Cahill on Thu Dec 20, 2012 6:56 pm

Hey. Great radio there! You did an outstanding job!
I am most proud of people like you.
You had it in you to build this difficult set. I couldn't have done it.
Great work!
How about putting in a 5" speaker, and, building a front panel for it.
?
Maybe done in blue, or, black steel??
It would really dress it up, and, should help with audio quality.
Radio is fantastic!
Bill Cahill

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Post by lucianopep on Sat Dec 22, 2012 4:56 am

Hello Bill! .. can you give me some advice? The CAV and IL CAG does not go very well you have an idea? :-) Thanks luciano

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Post by Bill Cahill on Sat Dec 22, 2012 12:34 pm

Excuse my stupidity, but, may I ask what those letters stand for?
Cav, and, IL CAG are unfamiliar words to me.
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Post by N7ZAL on Sat Dec 22, 2012 2:43 pm

The CAV and IL CAG does not go very well you have an idea?

Yes, please clarify what the CAV and IL CAG means?
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