[ICOM] 60 meters

[Stephen Budensiek]

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.
>
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