Garey, As you said, I should hear the sidetone also without the receiver. I was using the audio transformer but in the wrong way! I did connect the high impedence output of the TX with the low impedance input of the transformer! My fault!!! That's why I could hear nothing from the sidetone!
73 Franco IZ2OOS What I was hearing in the receiver was the RF 2010/3/24 Garey Barrell <k4...@mindspring.com>: > Franco - > > The problem is that the SIDETONE out of the T-4X series of transmitters is > High Impedance, and the 2-C does not have a Hi-Z input for it. So you have > to "step down" the impedance to speaker voice coil impedance and connect it > directly to the speaker. The AF output of the 2-C is ALSO connected to the > speaker. One side of the speaker voice coil output from the 2-C IS already > tied to ground, so all you're doing is connecting both transformers in > parallel to the speaker. Obviously you have to connect the transformer lead > to the _UNGROUNDED_ side of the speaker voice coil. If you have the > proper transformer, (most any output transformer should work somewhat,) you > should be able to connect the sidetone output of the T-4XB through the > transformer to a speaker and hear the sidetone. If not, then there may be a > problem in the T-4XB. > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs > <www.k4oah.com> > > > iz oos wrote: >> >> Hello Friends, >> >> It could be a problem of language but I cannot quite understand "FIG.3 >> CONNECTING THE T-4XB TO A RECEIVER OTHER THAN THE R-4". In this figure >> it is shown a 2-C with the speaker output connected to the speaker and >> the antivox cable from the antivox sidetone output of the T-$XB to a >> impedance audio transformer to the "Speaker Voice Coil"? What is the >> "Speaker Voice Coil" with one terminal connected to ground? I did >> connect the anti-vox cable to the audio transformer and a 4ohm speaker >> but I heard no tone. >> >> 73 >> >> Franco IZ2OOS >> >> > > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist > _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
