[Icom] 706 power output

[John Peters]

there are seperate BPF for each band so that will not be the problem. 

Check the voltage where entering the radio, I use an original power cord (2x
red and 2x black wire) which reduces voltage drop on the cable. With 13.8V
from the power supply I get 13.2V on the radio,(in FM TX mode) 110W on 80m,
and still over 100W on 6m on bird meter. (on a dummy load) 

If the radio drains enough current (arround 20 Amps) with low output there can
be a problem in the output transformer.. check if it gets hot, a resistive
relay or other loose contacts as they get worse on higher frequencies.

73! John PA5MS

Simon Watt-Wyness wrote:
> 
> In addition to this, Check the fuses in operation. Mine were getting warm and dropping to around 12v - I had reports of bad audio, like I was getting RF in the mike.
> I replaced my fuses with automotive blade fuses with inline sockets. Problem now fixed!!
> 
> Best of luck.
> 
> 73s De Simon - ZL1SWW.
> 
> -----Original Message-----
> From: k0sd@juno.com [mailto:k0sd@juno.com]
> Sent: Monday, 14 July 2003 12:43 a.m.
> To: icom@mailman.qth.net
> Subject: Re: [Icom] 706 power output
> 
> Ed,
>    Be sure your Power Supply is not sagging, and that you don't have any
> connections that are becoming resistive.   You pull more current on the
> higher bands for the same power out, I've seen this affect several 706's,
> mobile or fixed.  Check your voltage where it enters the radio with a
> DVM.   If it drops below 12.000 volts, you will see this problem.
> 
> 73's de Stephen, K0SD in NC
> 
> ***************************************
> 
> On Sun, 13 Jul 2003 03:18:27 +0000 w5htw@att.net writes:
> > Have noticed recently (and I admit I never paid much attention
> > before) that the
> > output on my original 706 has fallen off on 10, 12 and 15 meters, as
> > well as on
> > 6 meters.  Into a dummy load, I'm getting 95 watts output on CW or
> > FM (or RTTY)
> > on 160, 80, 40, 30, 20, and 17 meters, but am seeing only 65 watts
> > on 10, 12, 15
> > and 6.  And about 28-30 watts on AM, which is down markedly from the
> > 45 I used
> > to get on these bands.
> >
> > Perhaps it has been this way all along, but I don't think so.  I
> > wish I had
> > taken the time to measure it 'back then' but never gave it a
> > thought, as most of
> > my operation has been on 20 or 75 where it works great. The rig is
> > used largely
> > mobile, but only on 75, 40 and 20, but I just brought it into the
> > house and was
> > trying it on 6 meters when I noticed it was low in output.  Switched
> > to dummy
> > loa d and checked other bands.
> >
> > I'm wondering if there are adjustments that could have changed.  I
> > have the
> > schematic but no service manual.  Or perhaps others get a similar
> > reduction in
> > power at the higher frequencies?  (I doubt that, too.)   My guess is
> > one of the
> > BP filters is used for all of those bands (15/12/10/6) and I'm
> > wondering if
> > anyone else has first of all, seen the problem, and secondly
> > corrected it.
> >
> > Thanks
> >
> >
> > --
> > Ed Brooks, W5HTW
> > http://w5htw.home.att.net/index.html
> > Active since June 1956
> > ----
> > Your Moderator: Dick Flanagan W6OLD, icom-owner@mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.315 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
> 
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