[Milsurplus] One (or two) more R-45/ARR-7 question

[jmfranke]

Mike, a suggestion and then some real help. I have had success in the past
drilling out the coupler rivets and using a piece of fully etched printed
circuit board material to repair the coupler using 2-56 screws. For aligning
the parts, drill a quarter inch hole all the way through the insulating disc
and slide the pars on a 3 inch long rod before tightening the four insulator
screws. Then remove the 3 inch core.

Or, I have a similar phenolic-insulated 1/4 inch shaft coupler I could send
to you if you send me your mailing address.

John  WA4WDL


--------------------------------------------------
From: "Mike T" <gtsrmike at yahoo.com>
Sent: Thursday, October 03, 2013 2:02 PM
To: <Milsurplus at mailman.qth.net>
Subject: [Milsurplus] One (or two) more R-45/ARR-7 question

>
> Hello,
>
> I've finished up aligning my ARR-7 and the only issue I am having so far 
> is that the "Sharp XTAL" setting doesn't seem to do much of anything. What 
> I mean by that is that when I switch from "Broad XTAL" to "Med XTAL" I can 
> definitely hear a narrowing of the bandwidth but when I switch to "Sharp 
> XTAL" the receive bandwidth becomes very wide again. It sounds very 
> similar to "Broad IF". When I was aligning the radio adjusting C63 did not 
> seem to have any effect whatsoever. I also noticed that C62 had very 
> little effect. It had some effect but not very much. I am quite sure 
> everything is aligned well as the received signal strength drop from 
> "Broad XTAL" to "Med XTAL" is very small. It almost sounds like something 
> isn't connected or perhaps the crystal stops oscillating when in "Sharp 
> XTAL".
>
> Also, what does the manual, in section 5.27, step d, mean when it says to 
> back off on the secondary adjustment of T1 until the output reaches a 
> minimum value between the two previously noted maximums? Does that mean 
> when the phasing control is set for max selectivity that the received 
> signal strength will be at a minimum? I know that we are looking to 
> establish a good notch with this step for the elimination of heterodynes 
> but the wording has me confused.
>
> Finally, does anyone have a spare coupler that is used for the phasing 
> capacitor shaft? The phenolic insulating wafer on mine is broken and 
> therefore all insulating properties have been lost. Attached is a photo of 
> my (damaged) coupler.
>
> Image: http://i.imgur.com/yTbmfKn.jpg
>
> Thank you,
>
> - Mike
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