[ICOM] PRO III and shut down

[hamop]

Not that I can tell Roger and I did look at that too.  Strange and something 
I can only guess at, despite  all the Icom, Yaesu and Kenwood xcvrs I have 
had over the years. Never had this "shut down" issue and having a "cool 
down' period to bring things back temporarily.
73 Roger,
San

-----Original Message----- 
From: Roger (K8RI)
Sent: Monday, July 02, 2012 8:56 PM
To: icom at mailman.qth.net
Subject: Re: [ICOM] PRO III and shut down

On 7/2/2012 6:38 PM, Mike Olbrisch wrote:
> Two power supplies and one radio involved - sure sounds like something 
> going
> on with the radio.  You can prove (or disprove) the heat issue by shooting
> some freeze spray on the drivers and finals.  If it comes back in, it is
> heat related.

How about watching the current draw?  does it go above normal

73

Roger (K8RI)


>
> Good luck sir.
>
> Vy73 - Mike - KD9KC.
> El Paso, Texas - DM61rt.
> W5-SOTA Association Manager.
> NA-SOTA info: http://na-sota.org/
>
>
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of hamop
> Sent: Monday, July 02, 2012 16:29
> To: ICOM Reflector
> Subject: Re: [ICOM] PRO III and shut down
>
> Thanks. Bruce, I have a LATE PROIII, about December of 2010 with the newer
> finals from the original IIIs.   I just now went to a dummy load and had 
> 100
>
> watts output but after transmitting  dits and dashes for just about 15
> seconds, a rather quick loss of ALC and power to 5 watts. So, no amp 
> issues
> and grounds good and using 1:1 dummy load. This has never happen before.
> Even have used RTTY at 100 watts quite often with 150 countries worked 
> since
>
> last November. And some of that was rather constant calling a DX station. 
> CW
>
> DX calling for hours and no problems. But as of today ( and I did call a 
> DX
> station for 10 minutes today before this happened ) since problem 
> happened,
> just a few seconds of XMIT and have to turn PS125 AND PRO for 5 mintues or
> more and then get 15 seconds of OK transmit power. Again, receiver is fine
> and ALC is great during that time.
> TU for comments ..
> San K5YY
>
> -----Original Message-----
> From: Bruce
> Sent: Monday, July 02, 2012 5:20 PM
> To: 'ICOM Reflector'
> Subject: Re: [ICOM] PRO III and shut down
>
> Does it happen on ALL bands? Could be drivers ready to go and causing a
> intermittent short, the drivers, 2SC1972's were very
> finicky with their bias..factory at one time was setting the bias current 
> to
> high.
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of hamop
> Sent: Monday, July 02, 2012 3:16 PM
> To: ICOM Reflector
> Subject: Re: [ICOM] PRO III and shut down
>
> Ken, it happens with the amp off, and everything is the SAME as it has 
> been
> for 2 + years now and never a problem. Same good ground etc.  Just tried 
> the
>
> PRO III again and after just keying down about 10-15 seconds, the PRO went
> off. I am not running the amp, only 100 watts output. And, I have to turn
> off the PS125 also, if just turn off the PRO III for several minutes and
> back on > no output. If I turn off the PS AND PRO III for same minutes, 
> all
> comes back to 100w. So it is not just turning off the PRO that is 
> necessary.
>
> But, when back on line, I can maybe transmit a few seconds before shutdown
> to 5-6 watts, no ALC etc.  Thanks for information.
> San K5YY
>
> -----Original Message-----
> From: Ken Sands
> Sent: Monday, July 02, 2012 5:07 PM
> To: ICOM Reflector
> Subject: Re: [ICOM] PRO III and shut down
>
> Make sure ALL your (HEAVY) grounds go to a (HEAVY) common point and then 
> to
> a cold water pipe ground or other GOOD ground system..
> It seems you are feeding RF back from the linear to the Pro 3.
>
> My 2 cents,
> Ken K8TFD
>
> On Mon, Jul 2, 2012 at 5:59 PM, hamop <k5yy at cox.net> wrote:
>
>>      Hello all ... need some assistance. Never had this situation happen
>> before. Today while operating on 20m CW I noted no output, well maybe 5
>> watts, and I thought maybe the PS125 had blown an internal fuse for some
>> reason. I was running about 50 watts to a Titan amplifier at the time, my
>> main setup for 3 years now. Well, rather than tear into the PS125, I put 
>> a
>> PS85 in line and again a full 100 watts immediately. So thought the PS125
>> had truly blown a fuse. Well, after another shutdown to about 5 watts I
>> thought the PS85 had also blown a fuse.
>>     As one last effort, after about 5 minutes, I returned on the PS125 
>> and
>> PRO III and a full 100 watts output again. I found out that if I turned 
>> on
>> the rig and did NOT hook the PTT line to the Titan, all seemed to be OK
>> with no "shut down".  But, even keying the amp with an EXTERNAL foot
>> switch
>> and trying to drive the amp, bang ... again just 5 watts out, but it
>> returned to 100 watts after another 5-6 minutes.  Is the PRO III or PS125
>> and PS85 ( unusual for both to do it) heating up inside causing the
>> shutdown by some quirk feedback from the Titan amp?  Seems like if just
>> barefoot straight to the antenna, I can transmit 100 watts as normal with
>> NO shutdown. Puzzling to me for sure. Appears since same thing happened 
>> to
>> the PS 125 and 85 that both should not have developed the same 'shut 
>> down'
>> issue. That leaves me wondering if my PRO III finals are overheating some
>> how?
>>    Thanks for any suggestions.  Receive is fine the entire time. If I 
>> shut
>> down the PS and PRO III for just 3-4 minutes, the output may drop quickly
>> with about 20 seconds of CW and the longer units are off , the longer the
>> power stays up.
>> 73
>> San K5YY
>>
>> ----
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>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>>
> ----
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>
> ----
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> 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
>
> ----
> 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
>
> ----
> 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
>
> ----
> 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
>



----
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