"VE3AX" <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Jim:
This sounds similar to the problem I am having with an R-4B I was trying to get running last night. Things improved after changing out some leaky tubes and I can get the 1.35 volts at TP-2 in the R-4B, but I am still having the zeroing and max S-meter deflection symptoms you describe. S meter rises about 3 s-units in AGC OFF position after "zeroing" (just!) in slow/fast positions and that happens only if I crank the S meter zero pot to the end of its range. All resistors, diodes, voltages in that area check OK. S meter sensitivity will bring the meter to only about 20db over S-9 at the end stop of its range. Please post the suggestions when Garey answers you. Listening Garey???!!! Thanks and 73 Peter VE3AX ----- Original Message ----- From: "Jim" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, February 10, 2005 12:05 AM Subject: [drakelist] Drake 2-C Problem Help Please > > "Jim" <[EMAIL PROTECTED]> made an utterence to the drakelist gang > ---------------------------------------------------------------------- > Hello, > > Fired up a 2-C today that I had bought a year ago (oversea travel) and it > has a problem on receive. > > It appears to be an AGC problem. The radio has better "ears" in the slow or > fast position (when receiving CW, there is no difference between slow or > fast like other 2-C's I have used before) when compared to the off position > > After the radio has been on for 10 minutes the receive sensitivity starts to > fade. If I switch AGC off and then crank the rf gain, there is a slight pop > in the audio and the receiver again has ears. This fade happens about every > minute or so. > > I tried the alignment procedure in the manual and I cannot adjust the > voltage at TP1 (agc voltage) when in the slow position to the specified > minus 1.35 volts, I can only get to minus 1.0 volts. When I switch to the > off position, the AGC voltage goes more negative (minus 2.6 volts). This is > of course with the pot cranked to the end stop. > > After I had the radio on for one hour, the sensitivity did not fade, but the > radio had better ears in the slow and fast position compared to AGC off AND > there is no difference in the receive audio in slow or fast position. > > Also the AGC voltage could not be adjusted to minus 11 volts when I cranked > the RF gain control counter clockwise. I could only get to minus 8.5 volts. > > I have cleaned the switches and all power supply voltages are present (+135, > +92, +12, minus 52 volts, etc). > > Any and all help appreciated. > > Thanks > > Jim > > > > > > ---------------------------------------------------------------------- > On Behalf of "Jim" <[EMAIL PROTECTED]> > Submissions: [email protected] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: http://www.zerobeat.net > Brought to you courtesy of TLCHost.net http://www.tlchost.net/ > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- On Behalf of "VE3AX" <[EMAIL PROTECTED]> Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
