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On the 148 the connection at the 7.8 megahertz mixer which is at the emitter of TR15 right before it goes into L7. Or, I should say that where it seem to work best for me. Others may find better places to tap the IF. There is an issue of seeing the 7.345 megahertz oscillator on the band...

I think Kopcicle is right. Not at the the 34 megahertz for the 148 but the 7.8 megahertz IF. I'll have a try today as I made this circuit last night and played with it on my Cobra 29. There was some SSB skip last night which seemed to run North/South here on the west coast. It did sound real...

The circuit was super simple. I have the schematic or should I say a doodle on almost a cocktail napkin. Good enough, thou, to make it.

Hifi reception plus ssb, fm etc as well. I can see the point clearly now. I'll have to make one for myself and give it a try.

It looks like many people on youtube just run the sdr on 27megahertz directly. I wonder why bother with the 10.695 megahertz adapter?

There was no loading of the IF. It made no difference if the adapter was installed or not. It is just an mpf102 buffer circuit, powered by the receive only 8 volt supply. . Made from parts just "laying" around so the cost was practically zero. Okay, maybe one USD.

I saw a homemade pan adapter today on a Cobra 29. It was a simple buffer circuit connected to the drain of FET1 or 10.695 metgahertz output before the signal goes into L4. Then to an RTL-SDR HF converter connected to a RTL-SDR and the software tuned to 10.695 megahertz. SSB and AM sounded...

I admire your sense of humor, Kopcicle.

Cool, thanks for the information 543. I appreciate it. Are there any detector mods out there for a Cobra 29? Thank you in advance.

Does the type of detector make a difference on how distorted an asymmetrical signal sounds?

I didn't see any increase in watts out. The rf transistors are stock. I would really like to do the 13n10 driver and 13n10 final mod. I don't have any specific reason, it just sounds fun.

Yes, I have tried it with a Cobra 29 that originally had a 7222 in it. Fun project.

Thanks for the information on the obsolete chip. I have no idea if the IC used on the board is a faker or real but I did hook it up to a speaker and it sounded pretty good to where my GF told me to turn it down.

A "beta" tda2003 for the Cobra 29 replacement for the ta7222(and I assume other radio's). Works pretty good and really changes the tone in a good way. This modification is not my work but a friend lent this to me to try it out. Best to all

I think the formula referenced above Should be expressed as ((Watts x Resistance)*2)^.5 To the power of .5 is the same as square root. The expression (1500x600) * 2^5 does not equal 1314. 1500x600 = 900000 2^.5 =1.414 90000 x 1.414 = 1272600 On the other hand 1500 x 600 = 900000...

Is it okay to run your DC + modulated audio for the final through such a small switch? I mean is the switch hefty enough to take all that?

Oh gosh, I feel so "yesterday" because I just use my oscilloscope to make RF output power measurements. I wish I had the extra funds to buy a nice meter.

That doesn't sound too good at all. And some of those Lescomm products are quite expensive. Even scratched off part numbers from I.C.s. Thats just silly.

Thats odd. I'll have to try again. However, I have found a great deal of information about the Si5351 since I made the initial request. I am interested in having a peek at the code though. I'm curious to know if the programmer who wrote the software created a lescom emulation. I almost...

I was under the impression the PLL measures the VCO frequency output and makes sure the ncode from the channel selector, or internal ROM in this case, is the same as the VCO ouput. Like the rx ncode for channel 1 is 91 and the PLL measures the VCO and uses a DC voltage to adjust the VCO to .91...