B&K 2040

[2FB327]

In my quest to learn radio repair and my frugal habits of refusing to pay a fortune for a signal tracer on the bay that may not work.
I was looking thru the manual for my 2040 signal generator and noticed that you can inject a 455kHZ tone.
Has anyone here used this method for trouble shooting? and if so could you point me in the right direction..

 

[sonoma]

you msaid you did not want to buy a signal tracer and want to use the 2040. the 2040 injects the tone but you still need a signal tracer to check where you lose it at. the manual explains how to inject the tone. you still need a signal tracer

 

[2FB327]

Thanks, I just noticed that MFJ makes one, has anyone used one of these?

 

[Radio Tech]

Signal tracer is a very simple device. An amplified speaker with a probe coupled to it will work. Radio Shack made a "mini amplified speaker" that I have used many times. Google DIY signal tracer and you will see just how easy they are to build.
http://www.pasttimesradio.co.uk/build/diyradio.html


The 455KHz output in the 2040 is just that. If you have a dead receiver you use the 455 generator to inject the signal in to the radio. If receive is restored you then know the problem was in the 455Khz stage.

 

[2FB327]

Thank you, I remember seeing a tube video on building one, wish I had bought one before the stores closed, they had a stack of them, lesson learned.
I have made a probe from a sharpie so I'm half way there. I do have a pair of old desktop computer speakers that plug in and have a volume switch, perhaps I can use that. I did look on the bay they want over $30 for the radio shack one.

 

[Radio Tech]

Thank you, I remember seeing a tube video on building one, wish I had bought one before the stores closed, they had a stack of them, lesson learned.
I have made a probe from a sharpie so I'm half way there. I do have a pair of old desktop computer speakers that plug in and have a volume switch, perhaps I can use that. I did look on the bay they want over $30 for the radio shack one.

Desk top speakers from a PC works great

 

[2FB327]

Thanks, your videos are great. Perhaps some day we will see one on making one of these.

 

[Radio Tech]

Thanks, your videos are great. Perhaps some day we will see one on making one of these.

Thank you.
Yes I am planning on doing that in a "Shop Talk" video one of these days. I need to get online and find another Royce radio to sacrifice a PLL can from.

 

[2FB327]

If you ever need Cobra 29 or 25 parts, I got a lot donated from guys at work.