Re: [Drakelist] T-4XB LSB vs USB

Garey, congratulations to you We did it!!! I checked C6, it was looking fine, so I tried to move it a bit more hard and saw it was multi-turn! In fact, only then was able to null the CO completely!!! I hope to catch you on the air with this singing T-4XB! 73 and grazie mille! Frank IZ2OOS

Re: [Drakelist] T-4XB LSB vs USB

Frank - Congratulations! :-) C6 is also multi-turn. It is a "piston" trimmer, where turning the threaded adjuster moves a metal piston up and down within a tubular body with the other "plate" of the capacitor wrapped around it. IF you are able to null the CO completely, I wouldn't force it

Re: [Drakelist] T-4XB LSB vs USB

Hi! Homework complete! Yes, Garey was correct !!! The RF Output meter was not sensitive enough to balance the Balanced Modulator and I think I followed his procedure! I connected a Drake 2-C, with the mute cable and the antenna cable connected to the rx output of the T-4XB and then "spotted", so

Re: [Drakelist] T-4XB LSB vs USB

Garey, Of course, you are correct. I was thinking of the PTT for SSB. Sorry for misleading you, Frank. Ken, WA2LBI On Mon, Mar 22, 2010 at 10:13, Garey Barrell wrote: > Ken - > > Re-read that page.. The Carrier Balance is adjusted in CW MODE, BUT > with PTT closed instead of the KEY s

Re: [Drakelist] T-4XB LSB vs USB

Ken - Re-read that page.. The Carrier Balance is adjusted in CW MODE, BUT with PTT closed instead of the KEY so the SIDETONE is NOT generated. This puts the Carrier Oscillator within the LSB passband so as to have a larger output to null. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4

Re: [Drakelist] T-4XB LSB vs USB

Frank, The carrier balance adjustment is made in SSB, not CW. See page 15 of the T-4XB manual under "CARRIER BALANCE ADJUSTMENT". Ken, WA2LBI On Mon, Mar 22, 2010 at 09:42, iz oos wrote: > Hi! > > I did my homework! Indeed, the carrier oscillator crystal frequency > was not exactly set to 5

Re: [Drakelist] T-4XB LSB vs USB

Frank - OK. The RF Output meter is not sensitive enough to balance the Balanced Modulator. Tune up in the TUNE position on LSB, then switch to CW and close PTT. Then listen on an external receiver at the transmitter frequency for the "suppressed" carrier. Set AVC to FAST, and adjust the C

Re: [Drakelist] T-4XB LSB vs USB

Hi! I did my homework! Indeed, the carrier oscillator crystal frequency was not exactly set to 5.645 MHz, mainly due to C2 which was offest by 30 degree and a bit also to T14 which was not completely peaked. Switching sideband switch back and forth it was easy to note difference in plate current

Re: [Drakelist] T-4XB LSB vs USB

Hi! I did my homework! Indeed, the carrier oscillator crystal frequency was not exactly set to 5.645 MHz, mainly due to C2 which was offest by 30 degree and a bit also to T14 which was not completely peaked. Switching sideband switch back and forth it was easy to note difference in plate current

Re: [Drakelist] T-4XB LSB vs USB

Frank - Start with the Carrier Oscillator, Filter Match & Balanced Modulator alignment in Section VII, Section B. The idea is to get the Carrier Oscillator "centered" in the valley between the two filters as shown at "0" on Page 37. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line&

[Drakelist] T-4XB LSB vs USB

Hi Folks, I am testing my T-4XB. Before going in the air, I wanted to check my modulation first. Using different high impedance microphones I transmitted into a dummy load and listened to the receiver without antenna. I found that the LSB has a different modulation compared to the USB. The USB is