what is this mod on cobra 29?

[longhaireddwb]

A guy at work gave me his cobra 29 w/ front mic and wanted me to install an echo board and P+T. I opened it up and started adding the echo board and found that someone had added a 8.2K resister to the anode side of D-17. This is the diode that comes from the Deltatune.

What was this put in here for?

It did nothing for the power output or the modulation.
Is it to help with more or less adjustment of the delta tune? If so than why?:bdh:
This is just an AM radio so why even put in a deltatune is beyond me.

Anyone?

 

[Captain Kilowatt]

Is voltage present on the Delta Tune diode even in TX? My guess, and it is just that a guess, is that it was intended to allow the Delta Tune to work in TX as well as RX and may even have extended the factory range somewhat. In any event I agree with the uselessness(?) of a Delta Tune on an AM only radio as well.

 

[loosecannon]

the resistor thing sounds like someone misunderstood the mod they were trying to do.
maybe putting the radio on freq?
who knows.

the reason they put delta tunes on AM radios is to give you a place to mount your echo controls.
LC

 

[longhaireddwb]

I checked it out and this mod did not make the TX slide like the
RX.

Anyone else ever seen or heard of this mod?

I'm starting to think the guy that did it just didn't know what he was doing.:blushing:

Anyone else?