[ICOM] IC211e

[Richard Bown]

Hi all 
I suspect the noise is from the PLL, I unplugged the LO feed and replaced it from the sig gen
and clean.
This unit ha be well tweaked, quite a few jammed broken cores, and the preset pots tend to fall
apart at the slightest touch. thats one of the reasons it was passed to me, the pot in the APC loop
had died, so no output
The PLL board is in its original state no mods to it and no additional filter, fitted to the VCO
( SM5BSZ mod )
At least there is so much space to do things in those early rigs :)
I feel a winter project coming on .



On Sat, 27 Aug 2016 22:33:16 +0000
D C _Mac_ Macdonald <k2gkk at hotmail.com> wrote:

> This was also true of the IC-22S diode programmable 2m FM transceiver!
> I still have 2 dead ones in the closet with that malady.  SOMEDAY, maybe.
>  
> 73 de Mac, K2GKK/5 in OKC
> 
> Sent from my iPad
> 
> > On Aug 27, 2016, at 13:50, Jim Hargrave <w5ifp at gvtc.com> wrote:
> > 
> > Richard,
> > 
> > Are you using a switching power supply? 
> > 
> > Have you disconnected all cables going to computer...etc.
> > 
> > Have you tried shorting the Antenna connector?
> > 
> > 
> > 
> > Personal experience:
> > 
> > The IC-211 and IC-245 were notorious for noisy and intermittent PLL
> > boards.
> > 
> > The PLL board uses a 2 sided circuit board. Feedthroughs were not
> > plated, instead they soldered "Steel" pins in the holes. They look
> > like the common straight pin used for sewing. In time the pin heads
> > corrode and cause havoc. Replacing all (13 - if my memory serves me)
> > with a short copper wire completely solves the intermittent
> > operation.
> > 
> > 
> > 
> > Several reviews are posted at eHam:
> > http://www.eham.net/reviews/detail/926
> > 
> > 
> > 
> > 73, Jim - w5ifp at gvtc.com
> > 
> > 
> >   
> >>> -----Original Message-----  
> >   
> >>> From: Icom [mailto:icom-bounces at mailman.qth.net] On Behalf Of  
> >   
> >>> Richard Bown  
> >   
> >>> Sent: Saturday, August 27, 2016 11:17 AM  
> >   
> >>> To: icom at mailman.qth.net  
> >   
> >>> Subject: [ICOM] IC211e  
> > 
> >   
> >>> Hi all  
> >   
> >>> Not sure if this is an active list or not.  
> >   
> >>> but just incase it is  
> >   
> >>> I have an ancient IC211E which I plan to use as an IF for  
> > microwave
> >   
> >>> use.  
> >   
> >>> I have noticed a problem on receive and that is on SSB around  
> >   
> >>> 144.83 MHz there is a horrible burbling noise . It doesn't seem  
> > to be
> >   
> >>> the PLL going out of lock as the received signal a beacon is T9  
> > and
> >   
> >>> stable. And its still there with the antenna feed disconnected,  
> > so it
> >   
> >>> definitely internally generated.  
> >   
> >>> Any known common faults that may be applicable , before I dive in  
> > ,
> >   
> >>> as I'm aware that if its in the PLL its like opening Pandoras Box  
> >   
> >>> Thanks  
> > 
> >   
> >>> --  
> >   
> >>> --  
> >   
> >>> Best wishes /73  
> >   
> >>> Richard Bown  
> > 
> >   
> >>> Email :  <mailto:richard at g8jvm.com> richard at g8jvm.com  
> >   
> >>> HTTP  :   <http://www.g8jvm.com> http://www.g8jvm.com  
> >   
> >>> nil carborundum a illegitemis  
> >   
> >>> ###################################################  
> >   
> >>> ###############################  
> >   
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> >   
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> >   
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> >   
> >>> 400W, 70cms 200W  
> >   
> >>> OS: Linux Mint 18 x86_64 on a Dell Inspiron N5030 laptop  
> >   
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> >   
> >>> ----  
> >   
> >>> Your Moderator: Dick Flanagan K7VC:  
> > <mailto:icom-owner at mailman.qth.net> icom-
> > 
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> >   
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> ----
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-- 
-- 
Best wishes /73 
Richard Bown

Email : richard at g8jvm.com
HTTP  :  http://www.g8jvm.com
nil carborundum a illegitemis
##################################################################################
Ham Call: G8JVM . QRV: 50-432 MHz + Microwave 23 cms 140W, 13 cms 100W & 3cms 5W
Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W
QRV VHF 6mtrs 200W, 4 mtrs 150W, 2mtrs 400W, 70cms 200W
OS: Linux Mint 18 x86_64 on a Dell Inspiron N5030 laptop
##################################################################################