[Milsurplus] Harris RF-590A & R-2368/URR Problems

[W2HX]

If the bite is passing, I would think the RF section and IF sections and synth sections are all working ok. I wonder if it might be an audio problem. Either something is muting them, or something like a tant problem on something audio related....just a thought.

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Peter Gottlieb
Sent: Friday, March 17, 2017 6:16 PM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Harris RF-590A & R-2368/URR Problems

It's odd that BITE passes as a signal is injected for some of those tests.  Are you absolutely sure there is a problem?  Band conditions lately have been horrible lately and I can't pick up WWV or CHU either.  In the evening can you pick up the annoying JT signalling on 5357 USB?  I really doubt anything on your power line made it through the power supply to take something out and if a tantalum cap were shorted the BITE wouldn't pass.  I've fixed a number of these receivers and have a 590A myself.  I don't remember the internal connectors, maybe SMB?  Where are you located?

Peter
KB2VTL

On 3/17/2017 5:27 PM, john wrote:
> Just wondering; if there are any Owner's/Users, of these Radios, who 
> might have some 'Trouble Shooting Ideas' for me.
>
> Please allow me to describe the Issue(s); and see what you think or 
> might recommend as a 'starting Point'?
>
> The Issue(s); are Low, Low,  Sensitivity in both Radios...........both 
> Used to work very well and had a very high degree of Sensitivity.  
> Both Radios Pass the 'Bite' Self Testing on Power Up and there are no 
> 'error Codes'. Prior Functioning of Radios had Signals,  World Wide,  
> from a 8' Antenna Wire stuck in a Antenna Input Jack.
>
> I have never had these Radios connected to any type of outdoor 
> Antenna.  Only a short piece of wire inserted into the Antenna Input.  
> Radios have not been operated in any High RF Field; since I have owned 
> them.  They have; however; been continually plugged into AC Line Power when 'Off'.
>
> Very few B.C. Stations are now heard; and those I can pull; quite 
> weak.  Can't pull WWV @ 5mc.; 10mc  WWV very weak.  Not much on 20 
> meters, 40 meters, or 75 meters.
>
> I was going to try and by pass the built in pre-selector.  Thought I 
> had a 'Jumper' for that.  Turned out; I did not; at least not the 
> Right Size.  (does anybody know what size and Type the Internal Coax 
> runs are, in the Radio; between sub Chassis?  (what connectors)?? In 
> any event; I replaced one pre-selector with a Brand new one out of the 
> Package.  No improvement; as far as Sensitivity is concerned.
>
> So; the Question is:  what could possibly be affecting TWO Radios, 
> (that used to work just fine);........Sensitivity wise;  when the only 
> thing they have been doing is plugged into AC Power and mostly turned off?
>
> Batteries on the Control Board do not seem to be leaking.
>
> I do not have ready access to Test Equipment; at my present location.  
> I can say; that I have tried to use a Millen Grid Dip meter as a 
> Signal source; and it is hard to get a Signal into the Radio using the 
> G.D. Meter as an Oscillator; from 5 ft. away.  So; these Radios; you 
> might say; are basically 'Dead'....................
>
> Does anyone have any Ideas or experience similar to Mine; with these Radios?
>
> I am beginning to wonder if they might have swallowed some sort of 
> Voltage Spike off of the AC Line; that went into the Radios; even 
> though AC Power switch was 'Off'?
>
> I see where there is some sort  'Relay' in the Front  End Input Filter 
> on these Sets; but I only figured that is for Antenna Input Over Load?  
> Besides; I think this Relay is suppose to 'Self Check' at every power 
> up; and as I related;  Both Radios pass all 'Bite' Testing.
>
> Any Help or Suggestions much Appreciated.
>
> Thank you.
>
> John
>
> ARS K9JII
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