[Milsurplus] RT-128/ARC-21 vs RT-311/ARC-38

[Kenneth G. Gordon]

And I found a no-solder joint inside the coil-box of an R-25/ARC-5. Despite 
the no-solder, it had been painted with that red varnish to indicate it had 
been inspected.

And, yes, the receiver was intermittant.

Ken W7EKB


On 21 Mar 2016 at 17:23, grasshopper wrote:

> Jack,
>  Suspect it is fairly common and wonder how many radio's still
> worked, or were working well enough to be put in service?  I found a wiring
> error on a Motorola R390A IF deck that impact AGC functionality.  Was it one IF
> deck, or a whole series, one wonders...
> 
> Steve
> Kd3ht
> 
> -----Original Message-----
> From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
> Jack Antonio
> Sent: Monday, March 21, 2016 4:13 PM
> To: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] RT-128/ARC-21 vs RT-311/ARC-38
> 
> On 3/21/2016 4:39 PM, antqradio at sbcglobal.net wrote:
> > Ray
> > I cannot find any published reliability data on the ARC-38, 618S or 
> > 618T transceivers.  Everything out there seems to be opinion with no 
> > actual data to backup the claim so I cannot comment about the better 
> > reliability you mention.
> >
> While working on my RT-311, I wound up buying a naked chassis from Fair, 
> to strip the connectors out of to make
> extender cables.
> 
> While removing the connectors, I found a total of 3 unsoldered 
> connections, hidden by the insulated sleeving.
> 
> After the extension cables were made, I discovered the cause of the 
> intermittent in the SMO, which was a busted
> wire in one of the blue Amphenol hex connectors. Looked like the wire 
> was nicked when the insulation was stripped.
> 
> Just wonder how much of the reliability problems with this vintage of 
> radio were due to assembly issues like this.
> 
> Jack Antonio WA7DIA/4
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Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne