Temna schematic needed for 72-540 injector tracer

[DTiernan]

Hi does any one have a Tenma signal injector tracer schematic or an actual unit for sale, I would like to build one if possible
Thanks
Dennis

 

[PETERDECO]

Welcome.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=tenma+signal&_sacat=0

 

[Ignacio Burgos]

Hi does any one have a Tenma signal injector tracer schematic or an actual unit for sale, I would like to build one if possible
Thanks
Dennis

Hi Dennis
I"ll be glad to send you a schematic diagram of the Tenman 72-540 signal. tracer & injector and will also include the user manual just send me your address and I will send it to you with no cost. Thanks

 

[DTiernan]

Hi Ignacio
Sorry for the delay in getting back to you, I would be very much interested in getting the schematic for the tea 72-540 signal tracer injector
My address is ;
Dennis Tiernan

Mod Note: Address deleted for security and safety .... Dennis, please message the other user and swap info in private

 

[nacho1234]

Sorry for the one year delay

 

[dhanselnh]

Anyone have info on how to build a probe for this so as to not damage it?

 

[Delta Prime]

how to build a probe for this so as to not damage it?

Damage what?
The audio AF/RF probe or the
72-540 signal tracer/ injector?
The circuitry Submitted with the
AF-RF of probe schematic circuit below; is more than likely inside your unit, at least that is what the schematic tells me. All that is needed is a pair of what looks like (DIY) O’Scope probes, along with an RF coupler(not shone).
You must carefully inspect your unit to see if the circuitry is working properly and/or the components, especially the electrolytic capacitors must be replaced. That’s a given.

Velleman 'K7000' Signal Injector/Tracer & RF/AF Probe - UK Vintage Radio Repair and Restoration Discussion Forum

Velleman 'K7000' Signal Injector/Tracer & RF/AF Probe Homebrew Equipment

www.vintage-radio.net

 

[dhanselnh]

I worried about damaging the signal tracer. When I look at units for sale that included the probe, it looks "fat" which led me to assume there were possibly parts within it that keep from frying the tracer. I realize it's an assumption on my part, but that's the reason for the question. I've never used one before, so sorry for the noob question. I am trying to learn how to get some boat anchor radios back on the air.
Thanks for the information! Kinda surprised there aren't any manuals online for this thing that I can find.

 

[Delta Prime]

When I look at units for sale that included the probe, it looks "fat" which led me to assume there were possibly parts within it that keep from frying the tracer

Can you please take a photo of your unit, .. I need to see all your switches,knobs, test lead input, output, and hopefully they’re all legible & your Analog, VU meter.
Please reference the schematic supplied, On the input it looks like
you have a variable attenuation; up to 60dB’s in 20dB steps.
Also… you have series connected 100K Ohm + or - 0.1% resistor to the input. There’s nothing extraordinary
(minimal options) I think your unit came with the a couple of probes, some wire along with alligator clips.
Get out your old boat anchors I could Gide you as to where to inject the signal and where to probe that signal. almost forgot we’re gonna need an oscilloscope
Have to see if your generated AF/RF signal is rich harmonics so we could test the IF amplifiers in your radios.

 

[dhanselnh]

Sorry for delay. Work got in the way.

 

[Delta Prime]

to learn how to get some boat anchor radios back on the air.

How ironic… from boat anchor manuals this is your unit!
Follow the instructions ; if you have any questions, please do not hesitate to ask.

Bama Manual Archive

 

[dhanselnh]

Thanks, yes, I found that manual previously. However, there's no mention of anything to do with the probe, so that was my original question. I saw someone selling one on eBay and the probe was very chunky. Saw another youtube video of someone using a similar unit, and again, big fat probe. This lead me to assume that there might be a resistor or something within the probe. I realize that was and still is an assumption on my part. I'll carry on building a straight probe for it and see how it goes! Thanks for your willingness to assist.