[ICOM] 60 meters

[D C *Mac* Macdonald]

Hi, Stephen.

I previously posted info regarding this. Adam has also
commented. The 756 Pro and Pro II are both no go.

The Pro III is good to go on 60m.

http://www.bnk.com/w0qe/60m_operation.html


* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* Oklahoma City, OK *
* USAF, Ret (61-81) *
* * * * * * * * * * *

 

> Date: Tue, 25 Jan 2011 21:23:49 -0600
> From: kzerosd at gmail.com
> To: icom at mailman.qth.net
> Subject: Re: [ICOM] 60 meters
> 
> The mods.dk site had very little info on the 756Pro freq expand, a
> generic article, not dealing at all with right/wrong bp filter on 60
> m. I know I've seen some detailed info before, but can't remember
> where. Having the wrong BP filter inline is not the end of the
> world, it shouldn't be that hard to get the right one in-line via an
> added switch so the voltage to the switching diodes were diverted to
> the correct BPF on 60m. When I saw them earlier, had no interest in
> 60m, but now that I've had a massive heart attack, am basically
> semi-invalid, I'm looking for some different things to try. I've
> done lot of mod's on earlier Icom radio's, just haven't been into the
> 756Pro. Anyone know any other possible location for this info?
> Thank all of you for your help.
> 
> 73's de Stephen, K0SD in TX
> 
> ***************************************
> 
> On Tue, Jan 25, 2011 at 8:06 PM, <N4ch at aol.com> wrote:
> > Hello Steve,
> >
> > A good place to look for modifying virtually ANY "general-coverage
> > receive" transceiver to also transmit over the entire 1.8-30 MHz range (including
> > 60 meters) is:
> >
> > _www.mods.dk_ (http://www.mods.dk)
> >
> > There are quite a few entries including Icom, Kenwood, Yaesu, and pretty
> > much everything else that's out there. In most cases, the required
> > modification involves careful removal of a small SMT diode or resistor chip,
> > and/or "bridging" a set of solder pads that were originally left open. I've
> > never had a problem with any of the changes I've made using information from
> > this site, including the IC-706/MK2/G series of transceivers. I don't own
> > a 756/Pro/II/III, but I HAVE heard that at least one or two versions of
> > these rigs may not be the best candidate for such a change, because once
> > modified for general-coverage transmit, the PA output is routed thru a low pass
> > filter section that has the "corner" too low in frequency when 5 MHz
> > transmit is desired. I've heard (but cannot confirm) that the low pass filter
> > section that's normally selected for 80/75 meters is the one that's still
> > in-circuit when 60 meters transmit is selected, and this often cuts into the
> > PA's output by at least a couple dB, resulting in lower power output, and
> > excessive dissipation within the PA as a result.......not a good situation.
> > I've never heard of this being a problem on any other Icom radio; I've
> > used info from this site to modify quite a few other Icom radios (besides
> > the IC-706 variants), including the IC-707, 718, 725,6,8,9, 736,7,8, 745,
> > 746, 751, 765, etc. No problems (including the IC-756 LPF power loss issue
> > mentioned above) were ever evident in any of these radios.
> >
> > Good luck and 73, Herman, N4CH.
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
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> >
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html