In that case I am thrilled with the frequency that it is by default and am getting used to the pitch with each new CW QSO. :-)
Thanks for the information. Unless there was a potentiometer some where that could be easily adjusted and contemplated in original design by the engineers at R L Drake, I would not change it anyway. Again thanks Guys. Michael - N4MAK Sent from my iPhone On Nov 2, 2011, at 13:33, Mark Nace <[email protected]> wrote: > That's it, and whatever frequency you get is what you get on the regen. > Mark > > From: Steve Wedge <[email protected]>; > To: <[email protected]>; > Cc: Mark Nace <[email protected]>; Michael A. Kelly <[email protected]>; > <[email protected]>; > Subject: Re: [Drakelist] Side Tone Adjustment for TR4CW Possible? > Sent: Wed, Nov 2, 2011 4:22:44 PM > > My bad. > > Why did they use six different components? Does each R/C "set" alter the > phase a set amount? > > W1ES > > > -----Original Message----- > >From: Garey Barrell <[email protected]> > >Sent: Nov 2, 2011 10:27 AM > >To: Steve Wedge <[email protected]> > >Cc: Mark Nace <[email protected]>, "Michael A. Kelly" <[email protected]>, > >[email protected] > >Subject: Re: [Drakelist] Side Tone Adjustment for TR4CW Possible? > > > >Steve - > > > >Nope... The large section of the filter cap is additional decoupling > >of the B+ for the low level audio stages, (V9), and the small section is > >the cathode bypass for the VOX Amp, (V10a). C110, 111 and 112, along > >with R97, R98 and R99 form a phase shift network at the frequency of > >oscillation. There are plenty of formulas for calculating values for > >any reasonable frequency on the internet. ALL six pieces form the > >network, you can't just change one or two! :-) There is a limit to > >what you can do with the T-4X, because the audio tone is applied to the > >MIC input for TUNE mode (whistling into the microphone) and so has to be > >within the audio passband of the transmit filters. The tone is also > >used to drive the VOX, detected and integrated to control the 6EV7. > > > >The TR-4 series is a little different. It doesn't use the tone for > >TUNE, only for SIDETONE and VOX. It is generated in the same way, C180, > >C181 and C182, along with R126, 127 and 128. > > > >-- > >73, Garey - K4OAH > >St Charles, IL > > > >Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line > >and TR-4/C Service Supplement CDs > ><www.k4oah.com> > > > > > >Steve Wedge wrote: > >> I've thought about doing this in my Twins. Now that I've got a few extra > >> transmitters, this might be a good time to experiment. On the T-4X, I > >> believe half the can electrolytic is part of the sidetone r-c circuit. > >> > >> Steve, W1ES/4 > >> > >> -----Original Message----- > >>> From: Mark Nace<[email protected]> > >>> Sent: Nov 1, 2011 10:14 PM > >>> To: "Michael A. Kelly"<[email protected]>,[email protected] > >>> Subject: Re: [Drakelist] Side Tone Adjustment for TR4CW Possible? > >>> > >>> Mike, > >>> I think it's an audio phase-shift oscillator, so guess you would need to > >>> change > >>> some of the R-C values to get a lower freq. > >>> > >>> Others will give better thoughts I am sure. > >>> 73 > >>> Mark > >>> N5KAE > >>> > >>> > >>> > >>> > >>> ----- Original Message ---- > >>>> From: Michael A. Kelly<[email protected]> > >>>> To:[email protected] > >>>> Sent: Tue, November 1, 2011 8:49:00 PM > >>>> Subject: [Drakelist] Side Tone Adjustment for TR4CW Possible? > >>>> > >>>> Howdy, > >>>> > >>>> I had a 12AV6 tube (V2) go soft and after replacing it the "chirpy" > >>>> audio for the side tone went away, (no chirp on the transmitted > >>>> signal, just on my end) but the new side tone pitch is higher than I > >>>> prefer. Is there an way to adjust the side tone audio to get it down > >>>> in the 700-750 Hz range? (not volume, but pitch) > >>>> > >>>> Thanks, > >>>> > >>>> Michael N4MAK > >>>> > >>>> >
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