k9sqg
Thu, 17 Apr 2008 14:37:15 -0700
Somebody had mentioned a source of fan blades on the Drake Net a year or two ago.? Somebody had found a source but the minimum purchase was something on the order of 100-200 squirrel cages.? These were metal too.? There is a replacement blower (Dayton) that can be used in place of the original but minor mods are needed. -----Original Message----- From: Boyd Van Horn <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Sent: Thu, 17 Apr 2008 4:40 pm Subject: [drakelist] RE: Drake L-4B cooling fan blades. Does anyone have a source for fan blades for the old reliable Drake L-4B ? Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang ---------------------------------------------------------------------- Steve - I assume you have the shorting plug in the MUTE jack? :-) First lift up slightly on the Calibrator board. Sometimes the leads are left too long on the bottom of the board and short out to the chassis if it's pushed all the way down. There are fully annotated photos of the NB-4 on my C-Line CD, but Drake didn't provide any description or voltage information. I have a scan of the 34-PNB Noise Blanker on my TR-4 CDs, which are essentially the same circuit, and it has a circuit description included. That CD also has a separate set of photo's with voltage measurements for the 34-PNB. If you want the C-Line CD, I could include a copy of the 34-PNB manual and docs on it as well. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, B & C-Line and TR-4/C Service Supplement CDs STEVE SCOGGINS wrote: > STEVE SCOGGINS made an utterance to the drakelist gang > ---------------------------------------------------------------------- > I have a Drake R-4C receiver with the 4-NB noise > blanker that is not working. > > I have the 4-NB manual with schematic from the bama > website. > > There is no receiver audio when switched to NB > position. Using a scope I can see that the 7.935 Mhz > oscillator in the NB is oscillating. Perhaps the FETs > are blown in the NB. > > Does any one have a parts layout and theory of > operation for this NB. This type of info. would be > useful for troubleshooting. > > 73 Steve KE7RR > > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------