[ICOM] IC211e

[Richard Bown]

Hi Jim
Using its internal psu
NO computer attached and nothing heard on the other 2mtr rigs in the shack.
I hadn't shorted the antenna socket ,that may point to the front end hooting

yes I've heard some horrendous stories about the PLL and the plate thrus or lack of them.

I've seen the measured phase noise plots for them and the are not great.
As its one of the few early multimode rigs to generate NBFM directly at the IF,and not by
modulating the VCO, what I might do is replace the whole PLL with something like an AD9912 DDS
which has an excellent phase noise spec.
I use them in the HB rigs here, so I already have the control s/w .
The performance of the receiver is fairly good, I have a think about that , its not a difficult
mod, although it's major.
Thanks for the info Jim


On Sat, 27 Aug 2016 13:50:22 -0500
"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  
> 
> >> ###################################################  
> 
> >> ###############################  
> 
> >> Ham Call: G8JVM . QRV: 50-432 MHz + Microwave 23 cms 140W, 13  
> 
> >> cms 100W & 3cms 5W Maidenhead QRA: IO82SP38, LAT. 52 39.720'  
> 
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> 
> >> 400W, 70cms 200W  
> 
> >> OS: Linux Mint 18 x86_64 on a Dell Inspiron N5030 laptop  
> 
> >> ###################################################  
> 
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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
##################################################################################