[Icom] ProII IF output connection

[George, W5YR]

Hence the beauty of QRP, Ray.   <:}

Thanks for the report on the MARS performance. Doesn't sound very
promising, does it? A transverter may be the best approach yet . . .
although for my QRP purposes, 10 watts is more than adequate. Do you notice
any heating of the finals under those conditions? Does SSB retain a fairly
decent sound - notice any added distortion due to the change of operating
conditions?

I ran my Heath Monitorscope for some years observing the IF signal of my
receiver - this was back in the early 70's - and while it was interesting,
there was actually little that you could tell about another signal, due to
the filtering within the receiver prior to the scope. Severe flat-topping
could be observed, of course, but it could be heard first.

I keep an eye on all received audio here with a conventional dual trace
scope and on all transmitted audio as well as the accompanying r-f
envelope. This monitoring gives me confidence that I am transmitting a
clean signal and the received audio - taken from the rear-connector of the
PRO and fed through a Behringer 802A Mix/EQ (usually with flat EQ) is an
education to watch in comparison with the sound of the signals. CW keying
waveforms are especially interesting.

The point I was trying to make earlier is that with the PRO, I feel that
you can tell as much about a received signal by observing the audio from
the rear connector as by observing the IF directly. This is probably not
true of non-IF/DSP architectures.

Final question: what IF frequency will the SM220/230 work with? It might
match the 455 KHz of the PRO but that is before any DSP filtering or other
processing. I doubt that very much could be told about any one signal since
everything within the 15 KHz roofing filter would be present.

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437

"Ray, W2EC" wrote:
> 
> Besides the bandscope (spectrum) view, the Kenwood SM-220 (and 230 I
> expect) also gives a nice view of the received signal as well so you can
> see modulation, overdrive etc. The ProII LCD analyzer display is much
> nicer of course. If Icom would add the signal view that the Kenwood
> provides, it would be super.
> 
> I love both rigs, but if I were forced to absolutely give up one rig, I
> must admit I would keep my TS-940SAT/SM-220 combination and give up the
> ProII. The primary reason is that although my ProII is modified for MARS
> operation, the bandpass is so tight on some ranges that operation on
> some MARS frequencies (5.4 to 6.0mc for example) makes operation there
> with the ProII a somewhat iffy situation. By the time I get to 5.7mc and
> above, output is down to around 10 watts. If my rig is an average
> example, I can see there will be problems with people using the ProII if
> the 60 meter band opens for ham use, I don't think the ProII will
> provide full power based on what I'm finding for MARS use in that range.
> For MARS nets in that range I need to use my TS-940S for reliable comm.
> 
> Ray  W2EC