Re: Ensemble RxTx: Low Power output
- Alan -
here todays measuements using your page update:
Playing around I tuned to 14 MHz (instead 21 MHz). The figures are:
- Ends of T2 primary 0V7 (!) the "right" level
- T2 secondary 1V0 (0V4 on 21 MHz)
- Junction L1, C21 0V7
- Q6 Emitter and Base 0V25
Could there be a problem with T2?
Glad for any idea -
TU and 73 de Markus, dg3sbm
> > The kit is built for 15/12/10m.
> My figures were taken at 80m frequencies so will not compare too well with your band selection.
> > Using your link and setting the soundcard up your way I measured the following levels (all peak to peak):
> > - end of T2 Primary 0V4
> > - T2 secondary 0V4
> > - Junction of L1 and C21 0V4
> > - Q6 Emitter and Base 0V4
> > - Collector Q6 1V2
> > - T3 primary 1V2
> > - T3 secondary each end 0V9
> > - T4 primary each end 0V9
> > - T4 secondary 4V8
> Yes, Q6 and Q7/8 do seem to be working.
> > I suppose the problem to be somewhere between U8 and the driver section.
> If the two different ranges can be compared, yes. My figures show a voltage increase after L1/C2 but will 10m be the same?
> Later... I have checked my 6.3 and put my findings for 10m on my page.
> <http://sites.google.com/site/g4zfqradio/levels-measured-in-a-softrock-tx> I do see higher readings after L1/C2.
> But do not expect too much on 10m.
> 73 Alan G4ZFQ
- Hi -
the problem seems to be solved.
Really (!) scratch the wires of the transformers (here: T4) carefully (!)
--- In email@example.com, "dg3sbm" wrote:
> Hi -
> I have a problem here with my Ensemble which already took me hours...
> RX works perfect, but TX output voltage is only about 7V peak to peak (should be 20V).
> - Input from the soundcard is 2V p2p
> - TX OpAmps also give 2V p2p
> - TX Mixer Pins 7 and 9: 1V p2p
> - T2 secondary 1.2V p2p
> - Voltages at Q6, Q7, Q8 seem to be ok (as I consider).
> I suppose the problem to be somewhere between U8 and the driver section.
> Glad to get some help - I built that rig in march...
> Thank you,
> Markus, DG3SBM