[ICOM] RE: Sherwood Engineering and DSP, 706

[Paul Gates, KD3JF]

I have the same set up as you do. I still have some noise but I tell you the noise on 40 is the worse. To further complicate all of this I have a neighbor across the street that is generating a good S-8 noise and my antenna is picking it up.

I had the Utility person come out and he verified where the noise was coming from. We visited the neighbor and they refused to let the gentleman from the Utility company discover exactly where the noise was in their home.

In the house I am running power off the sealed battery for the 706. The only way I can use the receiver is along with digital speaker, DSP is to turn off the preamp and turn on the attenuator.

Now on mobile the DSP works much better like a dream but not in the apt. Any Comments?

Paul KD3JF

Ron Hashiro <rhashiro at hawaiiantel.net> wrote: >
> From: John Geiger 
> Reply-To: ICOM Reflector 
> To: icom at mailman.qth.net, kenwood at mailman.qth.net,yaesu at mailman.qth.net, 
> cq-contest at contesting.com
> Subject: [ICOM] Sherwood Engineering and DSP
> Date: Wed, 6 Jun 2007 18:38:14 -0700 (PDT)
>
> Sherwood Engineering just put up their Dayton 2007
> presentation on DSP and how it isn't everything it is
> cracked up to be.  See:
>
> http://www.sherweng.com/documents/Dayton2007w.pdf
Rob Sherwood in this writing, confirms what I had suspected. That the new
IF DSP-based radios are not that good.  I run an IC-706 MK II G, with 
the 1.9 Khz
SSB filter, plus the ClearSpeech audio DSP, and it's a mobiler's dream.

The 706 performs well in heavy pile-ups on the RX end.  However, if there is
someone in a mobile within a few hundred feet of me, he'll wipe out my
receiver, even on other bands.  Especially if he's on 20m, and I'm on 17 or
15m.  Can't be helped.

I do pick up all kinds of high impulse noise -- especially from sodium lamps
at the beach-side park at twilight.  Nasty noise on 40m and 20m.  I put
in the Clearspeech DSP, and it improves the audibility of many of the 
signals.
It removes perhaps 3 S signals worth of hash.  Makes long term
listening bearable, compared to without it.

I stopped by the Icom booth at Dayton on Sunday morning, around 9 am,
and the gentleman behind the counter tried to have me understand that the
DSP-based 7000 was better than the 706.  I'm sure the 7000 is a fantastic
radio (had another fellow ham upgrade recently from a 706 to a 7000),
but that the same time, the fellow with the 7000 noticed that the 706 with
the SSB filter and DSP was quite a performer.  Maybe Dayton/Icom
fellow was running his rig in a relatively impulse noise-free environment(?)

The gentleman at Dayton told me of problems with the ClearSpeech unit,
that he could hear a capacitive pumping in the audio.  We eventually
agreed that perhaps I had one of those units that works, and that he
heard a unit that was having production problems.  He told me that
if I put it on eBay, he's sure it'll be snapped up.  Right, like I'm going
to give up the baby that makes my 706 and 817 sing!

BTW, I picked up the ClearSpeech in Dayton I think it was 2003.
It was at the booth location where Tokyo Hi-Power was this year.
I picked up the SSB filter in 2004, and haven't looked back!
Hard crystal filters in the 706 (CW and SSB), plus a darn good
audio DSP (not like the Timewave rubbish), and that rig is unstoppable.
Kicks butt compared to the TS-50, FT-817 and FT-857.

Not sure how the new West Mountain Radio version will perform.

Dick, keep up the fine reflector!

Ron Hashiro, AH6RH
Honolulu, HI
http://ronhashiro.htohananet.com/am-radio/in-hawaii.html



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