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Users browsing this forum: Google [Bot] and 1 guest. Posted: Feb Sun 08, am. The tubes all light and I get static on the speaker. I have put rf into pin 7 and can hear it at and I do get some noise when I inject an audio signal as well.
I am not sure where to go from here. Start by testing all the tubes. Next change out the electrolytic capacitors. 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.
Read the manual. Use a shorting plug at the mute jack. That is about it. Those are pretty solid radios. If it doesn't work after the above, you will need to start checking the voltages and resistance at the pins, but I would go through the basics first. I have an R-4B that I brought back from the dead by following the list above. I try and not start adjusting anything inside the radio until everything else fails. I will check the phone jacks, I think they are ok. I have two more electrolytics to install.
Posted: Feb Sun 08, pm. I'm not sure of the R4B, but those Drakes would run transceive with a companion transmitter. Make sure that any jumpers are in place rear apron that might be required if the unit isn't paired with a transmitter.
They could run on either VFO. Posted: Feb Mon 09, pm. I just finished bringing a R4C to life. Voltage measurements are critical and all electrolytic caps should be replaced, but may I suggest a few things to try first which MAY help isolate the problem s. What I am suggesting below is not how a seasoned tech would go about it, but I get the feeling you may not be a seasoned tech and following the steps listed below may keep you from going the "shotgun" approach and getting frustrated.
If you have a general coverage receiver handy set it up next to the R4B and run a small length of wire from the general coverage receiver's antenna terminal any lay it beside the R4B.
Tune the general coverage receiver in turn to the frequency of each band select crystal with the band switch in the R4B in the corresponding position. This is the frequency printed on the crystal can not the frequency the R4B is tuned to. The only ones I remember from my R4C are The meter The 10 meter crystal should be there along with all the other standard band select crystals. You should plainly hear each band select crystal oscillating in the general coverage receiver. This will determine whether or not the band select crystals are oscillating.
If so go the the next step. Next tune the general coverage receiver to somewhere in the output frequency range of the VFO in the R4B. This will confirm or not that the VFO is working.
Then tune the general coverage receiver to each IF frequency. I do not remember what they are in the R4B. You should hear each IF frequency in the general coverage receiver. This should confirm or not that each of the IF's are working. If you hear some but not all of the above oscillators in the general coverage receiver, your problem at least one of them is in the area where you hear nothing.
Do some voltage checks. Does the crystal calibrator in the R4B work? You can verify whether or not it is working by turning it on and tuning the adjacent general coverage receiver to KHz points.
If the crystal calibrator is working you will plainly hear it every KHz in the general coverage receiver. It is is not working you won't hear anything. If working you can use the built in crystal calibrator as a signal generator. Can you hear it at all in the speaker - even very faintly? If not does the S meter deflect when the crystal calibrator is on? Posted: Feb Sat 14, pm. I still get only I was testing it last night and heard a signal at 3.
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 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. You are right Dick I am not a technician, just learning so I can work on these when I retire, in six weeks yeah!!! Greg, Use your scope to see if there is output from the pre-mixer at the cathode of mixer tube V2, the premix frequency will depend upon the band in use and should be observed to change as you tune the PTO.
If you don't have premix output then use your scope to check for fixed frequency output from the HFO and variable frequency output from the PTO into the pre-mixer tube. Oxidation of the switch contacts often result in the PTO not being connected to the premix circuitry.
Of course the switch should end up in the VFO position. Rodger WQ9E. Posted: Feb Sun 15, am. I have cycled the vfo-crystal switch several times, hopefully the oxidation has been dealt with greg ve3gph. The amplitude will change when the preselector is adjusted. Put your scope on pin 1 of V8 and you should see the output of the crystal high frequency oscillator. With the R-4B set for 80 meters you should see an output ranging from 9.
As you tune the PTO from one end of the range to the other you should see the width of the sine wave display on your scope change. You can confirm the PTO and premix output frequencies by also listening using a general coverage receiver tuned to the appropriate frequencies with an antenna lead near the premix tube.
As I understand you have already confirmed that the 5. Greg, 3 and 4 are the heater so you are seeing 60hz AC there. So to be clear are you not seeing anything at pins 1 and 7 of V8? Make sure you are using enough scope sensitivity. Yes Roger I do have output on those pins, not a pure sine wave about 6 volts on pin 7 and about 6mv on pin 1 greg. OK, that level sounds low on pin 1. What scope and probe are you using? If possible use a 10X probe if you are not already. With the scope connected to V8 pin 7 do you see the waveform width change as you tune from one end of the VFO to the other?
With the probe on V8 pin 1 what do you see when changing to different bands? Make sure that the auxiliary crystal selector is in the norm position. Greg, The VFO amplitude pin 7 of V8 shouldn't change as you tune but the period of the sine wave should. Tune the VFO to one end of the range and adjust the timebase so that the widest point of the sine wave covers exactly 2 major divisions on your scope screen and then tune to the other end and compare width.
So what amplitude measurements are you getting on other bands on pin 1? At this point it would be nice to back up your scope measurements with a receiver if you have a general coverage receiver that will tune to the crystal and VFO range.
For example, the 40 meter range uses an The PTO covers from 4. Greg, I am taking the Cheyenne the German Shepherd out for a walk and then she is headed to bed and I am getting on the air for awhile. It is always a good idea to never spend too long working on vintage gear since the high voltage within can give you anything from a minor nip through a trip to the next dimension.
A friend from long ago had one homebrew transmitter that I named Christine after the Stephen King novel because both the builder and second owner were both killed by it. He used it for many years and then it was parted out. That was one rig I had no desire to own. Posted: Feb Sun 15, pm. I can pick up a signal from the r4b on my shortwave receiver at around 4.
Greg, Does the signal you pick up at 4. If it doesn't then that sounds like a spurious signal picked up from something else. If it doesn't tune put you scope back on pin 7 the VFO input to the premix AND set the xtals switch away from norm to a position which doesn't have a crystal installed. If the sinewave is still there it either should vary as the VFO frequency is varied OR you are simply measuring AC line pickup, that will be readily apparent from a quick calculation of the frequency based upon your display and time base setting.
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R.L.DRAKE R-4 B Instruction Manual
Drake R4B Operator Manual.pdf