[ICOM] TX Problem IC970A 2.4 GHZ module

[STeve Andre']

Thats really weird.  I'm not doubting you, but I talked with someone
at Dayton last year who had a problem with an ic-1201 rig, the
Japanese version, and he called them, and after a little comic
confusion of English manglement, he was able to ask his question
and got something in the mail later.

I've never talked with them, but I have heard they're very 
helpful.  I can only suggest trying again?

--STeve Andre'
wb8wsf

On Tuesday 01 March 2005 23:58, Gary wrote:
> yes, repeatedly but they would not reply.
> Gary
>
> STeve Andre' wrote:
> > I'm curious: have either of you contacted Icom in Japan about these
> > problems?
> >
> > --STeve Andre'
> > wb8wsf
> >
> > On Tuesday 01 March 2005 22:54, Gary wrote:
> > > I have this problem with my 1.2Ghz module. I'm still troubleshooting
> > > but it's looking like a bad PA module. The effort is a major pain
> > > without a schematic. I've asked for a schematic copy from every forum I
> > > could find but nobody replied. Not even Icom America or Scott Malcolm
> > > had literature on the 970 option modules. Doug is the first in my
> > > experience to even admit to having one of the 2.4Ghz modules, I hope he
> > > has literature to go with it. Good luck Doug. Gary
> > >
> > > "NICK.WALLACE" wrote:
> > > > Hi All,
> > > >
> > > > I am posting this on behalf of Doug VK4OE. We were wondering if
> > > > anybody else had encountered the same problem which is as follows. I
> > > > will pass any info received onto him.
> > > >
> > > > Thanks in anticipation.
> > > >
> > > > Nick   ZL1IU
> > > >
> > > > >From Doug.....
> > > >
> > > > Just to save you some typing, I'll describe again what I am
> > > > experiencing, which only relates to the 2.4 GHz module in transmit
> > > > mode....the other features of this excellent radio are currently
> > > > working well.
> > > >
> > > > The problem is one of "fading" transmitter power as something
> > > > obviously is heating up in the 2.4 GHz transmit path.  The scenario
> > > > is that the radio has been switched off for a time long enough for it
> > > > to cool to room temperature internally, then it is powered up and
> > > > switched to 2.4 GHz transmit mode (continuous, e.g. FM).  The RF
> > > > output control is set to maximum.
> > > >
> > > > It transmits the full 1 Watt for 2 to 3 minutes (or 5 minutes if
> > > > ambient temperature is cooler) then, over a period of about a minute,
> > > > the transmitter power gradually falls away to around 50 mW.  Whilst
> > > > this is happening the ALC gradually climbs to a high level.
> > > >
> > > > Momentarily switching to RX or switching the whole radio off briefly
> > > > then on again do not lead to a return to 1 W output.  Only powering
> > > > off and letting the whole radio cool for an hour or so leads to a
> > > > return to 1 W output, and being ready for the whole fault sequence to
> > > > occur again.
> > > >
> > > > It is conjectured that there is something wrong with one or more
> > > > component in the RF path between the TX amplifier and the antenna
> > > > connector, something which is thermally active.  Has anyone else had
> > > > a similar problem and found the solution?
> > > >
> > > > Thank you
> > > >
> > > > ----
> > > > 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/
> > >
> > > ----
> > > 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/