[ICOM] Internal PS question

Wed Mar 7 23:08:31 EST 2012

That was back in the 80s, John and I recall that I got the rig spankin' new
with all the bells and whistles plus an AT-500 that I'm still using.  Don't
recall if the rig had a built-in PS-30 or 35 but I am using the P/S today
in the IC-761 I got in 1988 and it still works just fine.  The one that
failed went with the 745 when it was sold.  As I recall the 751 was a
marginal step up from the 740/745 but their receivers were very similar.
The only "complaint" I had with the 745 was its physical size.  I really
disliked the small knobs and the real estate on the front panel.  It was a
small city lot compared to the 761 which has about a third of an acre.  But
there was nothing I couldn't hear with it...same as the 761 in that
respect.

73

Al, VE1AL

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of John G.
Sent: Wednesday, March 07, 2012 10:53 PM
To: ICOM Reflector
Subject: Re: [ICOM] Internal PS question

That is an interesting observation. I have never used a 745 nor known
anyone who owned one.  You don't see them for sale very often, but for what
they are usually asking for them you could get a 751A for around the same
amount. 
The 751A would come with the keyer and 500hz CW filter as standard, both
extra costs for the 745

----- Original Message -----
From: "Al VE1AL" <VE1AL at eastlink.ca>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Thursday, March 08, 2012 12:55 AM
Subject: Re: [ICOM] Internal PS question

>I wanted a rig that would cover all bands and I got the IC-745.  It was
> just as good as the 740, which a friend had, and he said so after 
> listening
> to my 745.  I never heard a 740 so I can't comment but I can say the 745
> was one mighty fine little raddio.
>
> 73
>
> Al, VE1AL
>
>
>
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of Mike Olbrisch
> Sent: Wednesday, March 07, 2012 6:16 PM
> To: 'ICOM Reflector'
> Subject: Re: [ICOM] Internal PS question
>
> You have it right Gary.  The 740 was a ham-band only RX, and at the time
> the general coverage radios didn't have as good a receiver and the 
> ham-band
> only rigs.
>
> Vy73 - Mike - KD9KC.
> El Paso, Texas - DM61rt.
> W5-SOTA Association Manager.
> W5-SOTA info: www.qsl.net/kd9kc/
>
>
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of Gary Fiber
> Sent: Wednesday, March 07, 2012 08:54
> To: ICOM Reflector
> Subject: Re: [ICOM] Internal PS question
>
>  Icom ran the low level of transmit RF through the speech processor
> switch. a Common failure mode was no RF out. So I would have the callers 
> to
> support work the speech processor switch several times and generally that
> would restore the 740 to full transmit out.
> Though the best result was to replace that switch. The 740 was not 
> involved
> with the trimmer cap troubles as later rigs were so far as I remember. 
> Seem
> to me it was ham band only receive but it been a few years since I've
worn
> the support hat for Icom.
>
> Gary K8IZ
>
> On 3/7/2012 6:39 AM, Mike Olbrisch wrote:
>> I stopped using my 740 when I got a 781.  No question which was better
>> there.
>>
>> Truth is, the 740 had one of the best receivers of its time.  If I had
>> to use another 740 in the shack, I wouldn't feel too bad about it.
>>
>> The speech processor switch is prone to failure. I had replaced mine,
>> and when I sold it an extra switch went with it.  I am not so sure
>> about the
> PLL
>> caps, I never had a problem there.
>>
>> Over-all, it was a great radio.  I never regretted owning it, I
>> sometimes regret selling it.  But with a 781 w/ AT-500 and 2KL, 703,
>> 706, 551D,
> 820S,
>> full-stack 901A and FT-817 in the shack, I needed the space.
>>
>> Vy73 - Mike - KD9KC.
>> El Paso, Texas - DM61rt.
>> W5-SOTA Association Manager.
>> W5-SOTA info: www.qsl.net/kd9kc/
>>
>>
>>
>>
>> -----Original Message-----
>> From: icom-bounces at mailman.qth.net
>> [mailto:icom-bounces at mailman.qth.net]
> On
>> Behalf Of John G.
>> Sent: Wednesday, March 07, 2012 07:29
>> To: ICOM Reflector
>> Subject: Re: [ICOM] Internal PS question
>>
>> So is the Icom 740 still a pretty good performer overall?  Any typical
>> age related problems that show up with it affecting its reliability?
>>
>>
>> ----- Original Message -----
>> From: "Mike Olbrisch"<mike-2007 at elp.rr.com>
>> To: "'ICOM Reflector'"<icom at mailman.qth.net>
>> Sent: Wednesday, March 07, 2012 2:09 PM
>> Subject: Re: [ICOM] Internal PS question
>>
>>
>>> Good morning Steve and others.
>>>
>>> I have three of those internal power supplies.  They are switchers,
>>> running about 20 KHz IIRC.  The first one is inside the IC-PS30 case.
>>> The second is in like-new condition and ready to replace the first
>>> when it dies.  The third is in need of rebuild, it quit and was
>>> replaced by the first.  I have the parts, I currently lack the time.
>>>
>>> I have found them to run fairly cool under load, and I cannot say I
>>> have ever heard any noise I could attribute to those supplies.
>>>
>>> When I have had them fail, I usually just re-cap them and they seem
> fine.
>>>
>>> I had a fully-loaded IC-740 several years ago.  When I tried to sell
>>> it as-is I got offers of like $300 on it.  So I stripped it out, sold
>>> the bare radio for $300, sold the filters and other accessories for
>>> another $400
> or
>>> so.  I think I still have the keyer board around here somewhere, no
>>> one seemed to want it at the time.  So I tossed it in a box of junk
>>> up in the storage loft above the garage.  I kept the internal supply
>>> as a spare for the PS-30, same guts.
>>>
>>> Anyway - those supplies are pretty good in my book.
>>>
>>> Vy73 - Mike - KD9KC.
>>> El Paso, Texas - DM61rt.
>>> W5-SOTA Association Manager.
>>> W5-SOTA info: www.qsl.net/kd9kc/
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: icom-bounces at mailman.qth.net
>>> [mailto:icom-bounces at mailman.qth.net]
>>> On
>>> Behalf Of Steve
>>> Sent: Tuesday, March 06, 2012 23:04
>>> To: ICOM Reflector
>>> Subject: Re: [ICOM] Internal PS question
>>>
>>> I was merely inquiring if they really used switching type supplies
>>> knowing how bad they can be for noise.
>>>
>>> ----
>>> 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
>>
>
>
> --
> Gary Fiber K8IZ
> GROL PG-19-6691 with Shipboard Radar Endorsement Washington State
Resident
>
> ----
> 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