[TMC] GPR-90 Receiver is ailing

Tue, 04 Mar 2003 06:06:57 -0600

Thanks to all that have responded.

As pointed out by Mike and as shown in the GPR-90 instruction book, C-104 is 
described as, "C104, A, B,: Capacitor, fixed: electrolytic, 40-40 mfd, 450 
wvdc, B+ Filter, V14, CE-102" however, the actual component was a CDE 
capacitor, part CC0410A 20 to 40 MFD 500 W.V, 20 to 40 MFD 500 W.V. and an 
unused 15 to 20 MFD 500 W.V. UPN 10808.  Hopefully the can I have ordered 
will work.

On the other hand other list members have pointed that radial types are 
available and can be placed beneath the chassis, as well as placing lower WV 
units in series where the total capacitance is halved and the W.V is the sum 
of the W.V. units.  Equalizing resistors were also mentioned.  I had wanted 
to make it look like the orignal or at least as close as possible.

De-Oxit seems to be the contact cleaner of choice.

Thanks to all.  I will post later the prognosis.

73, Jim, wd4air

>From: MIKE SOUHRADA <[email protected]>
>To: James Duffer <[email protected]>
>CC: [email protected]
>Subject: Re: [TMC] GPR-90 Receiver is ailing
>Date: Mon, 03 Mar 2003 17:37:21 -0600
>
>James Duffer wrote:
>>The power supply electrolytic filter capacitor C-104 failed.  I have a 
>>tentative replacement on the way....but the working voltage is only rated 
>>at 400 VDC.  The original is rated at 500 W.V.
>Jim
>My docs are stored but looked at my unit and C-104 shows 450 WVDC not
>500. The actual voltage is about 300 on my unit so I think the 400 should 
>be ok.
>>Another problem, only band 3 of this unit is functioning and at very low 
>>output.  What is a good contact cleaner that will not leave a harmful 
>>residue?
>Deoxit 5 is used by all the BA guys. I used 99% alcohol initially and
>it worked quite well. Never bothered with the Deoxit.
>Check the antenna input. Not at all conventional. Mine was screwed up
>by a previous owner with a SO 239 improperly connected. The original
>doesn't use that at all but paired feed to a transformer T1.
>
>Mike
>Iowa
>
>
>>Thanks in advance.  Jim, wd4air
>>
>>
>>
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