Drake r 4b manual

So choose your SDR wisely. If you tune 7. If you tune As you tune your radio left or right, the spectrum is going to move to the left or right.

Your tuning point will always be right in the middle of the display. Tube radios are often high impedance signals. I connected it to my 1st Mixer as above, and it rendered the receiver pretty much mute, because it drained all the signal. There was some speculation that an appropriate coupling capacitor might help, but really that amplifier board is not designed for a high-impedance input.

I ended up using the following design:. I lifted this circuit right out of the carrier oscillator circuit from my Drake manual. I grabbed one of the transistor stage schematics. The circuit is fairly simple. The incoming RF from the 1st Mixer is coupled by a 10pF capacitor.

The single red wire is my input to the board from the receiver. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience.

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Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Privacy Overview. Necessary Always Enabled. If possible use a 10X probe if you are not already. Our new search experience requires JavaScript to be enabled. TR-3 to TR7 Modification Webmaster, add a Remote rating Drake R4B manual — related links We thought you might also be interested in these additional web sites, selected from the same category: That is about it.

As I understand you have already confirmed that the 5. Clean up the radio, replace any light bulbs, check if the phono connectors on the back are still making contact with the the male phono plugs. Feb Sun 15, 3: Feb Sun 08, 4: Radio Communication Equipment If working you can use the built in crystal calibrator as a signal generator.

Those are pretty solid radios. Make sure you are using enough scope sensitivity. He used it for many years and then it was parted out.

Buying Format see all. Sign up to our Newsletter Get our latest news and links in your email. I can pick up a signal from the r4b on my shortwave receiver at around 4. Feb Sun 15, 4: I have measured the voltage on all the tubes and pin 1 v3 seemed to be the one that was out the most, it is supposed to be I do not remember what they are in the R4B.

Installing 2- 3- 4-filtering kits. Guaranteed by Sat, Jan 5. Page 1 of 2. I tried the short wire with the shortwave reciever and I could not pick anything up on the receiver trying to listen for the crystal frequencies. The meter I just finished bringing a R4C to life. And when you click on the file or icon it will count as a download. They could run on either VFO. This is a 62 ohm cable. Those are pretty solid radios. Drake R-4C Receiver instruction manual. Save drake receiver to get e-mail alerts and updates on your eBay Feed.