Garey Barrell <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Steve -
Drake never provided a service manual for the 4 Series, other than the SPR-4. The biggest problem is locating parts on the chassis. I have made a parts locator manual for the C Line, maybe do the B Line one day! It's a lot of work, and is not a big seller. A sample is at
<http://hr99.home.mindspring.com/R-4C_Servicez>
It makes it a LOT easier. All the information you need to service the receiver is in the Drake manual, except where parts are located.
As for your R-4B, we'd need a lot more information to troubleshoot. Is it low on all bands? How low? What is the signal strength of the calibrator? Are all the tubes lit? Especially V1.
Obviously the first thing is to see if the S-Meter is at 0 with no signal applied, and goes to 60 dB over S-9 when the RF Gain is turned full CCW.
If this is good, then check the bias voltage at TP-2 as described in the manual. This must be very close to -1.35V and sets the sensitivity of the receiver.
Next is to try the Antenna, RF and Injection alignment as described in the manual. Do a single band, using the calibrator, to see if any improvement can be made. Do not bother with any of the other alignment, as it it almost certainly OK, unless of course someone has been "tightening all the loose screws".!
Let us know what you find!
73, Garey - K4OAH Atlanta
Steve Schaub wrote:
I'm restoring a Drake R4B that has low rx sensitivity. I have the original manual shipped with the receiver, but was wanting to know if there ever was a "service" manual available for the Drake R4B? If this manual ever existed, anyone know where a person can get a copy?
Many thanks for taking the time to read...............
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* ARS: W4PF
* Steve Schaub
* E-mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
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