[Boatanchors] RME 69 Crystal Filter and Cc/C adjust

Sun Apr 14 14:57:08 EDT 2013

Gang,

Many good observations here!   I would probably agree more to the "cost of 
production" thing on silk screening the panel would have been a pain 
especially on a "wrinkle finished" paint job!  The "operator worth his salt 
doesn't need control function captions"  is rather "snotty".  This is not 
new, as I have had a tremendous amount of trouble using "Windows 7" after 
using "XP" configured with Windows 98 icons and layout.  To me it's a bunch 
of "BS" to change the "color and shape" of all the furniture and rearrange 
the furniture "just because".  A good computer buddy of mine and I fight 
over this all the time.  The ONLY thing I learned "practical" was a 
statement made by a guru ("Woody Leonard"?)  That EVERYTHING is there but 
the locations are different and names have been changed, but it was "same-o, 
same-o" stuff!   Sorry for the diversion, I still can't help bitching about 
Bill Gates seemingly wanting an infinity of money from what is basically 
just a "revision" tactic of the same old stuff.  Us "old farts" get hung up 
on the way something looks and you don't want to mess around with changes. 
Yup! Stuck in our ways!

One more "warning" I forgot!  The "S": meter circuit in the RME-69 should be 
probed around VERY CAREFULLY.  If you short a meter terminal to ground, the 
result will be a bent pointer and you gotta repair it your self and you 
ain't gonna find a replacement!  Been there, got ham fisted with a test 
prod, and did all that!  Makes you sweat profusely!

73 to all,

Sandy W5TVW

-----Original Message----- 
From: Al Klase
Sent: Sunday, April 14, 2013 12:45 PM
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] RME 69 Crystal Filter and Cc/C adjust

Gang,

Hi-res scans from original RME-69 documents have been posted:
http://www.skywaves.ar88.net/commrx/RME/RME.html

This should clear up the crystal-filter schematic issue.  Their rambling
verbal explanation is another matter entirely.

Al

On 4/14/2013 1:14 PM, Al Klase wrote:
> Hi Bill,
>
> I have my 69 on the bench, and it appears my restoration and alignment 
> efforts of the late '90 have held up.
>
> The positions of the Crystal Filter Switch (B) (upper right corner) are, 
> left to right, OUT - SERIES - PARALLEL
>
> The Crystal Selectivity (E) variable capacitor, CH, is just below the 
> switch.
>
> I'm blessed with an original copy of the documentation, and the switch 
> connections are clear, unlike all the third-order scans on the web..
>
> It's a single-pole three position switch, with the common terminal 
> connected to the grid of the 6D6.
> In the left-hand position, it shorts out the crystal for full frequency 
> response.
> In the middle position it does nothing.  This allows "normanl" crystal 
> filter action.
> In the right-hand position it shorts out the "phasing capacitor" CI, the 
> trimmer inside the filter can.
>
> Sandy's right, your going to need a crib sheet for the unmarked front 
> panel.
>
> I strongly suggest you replace ALL the paper caps before you attempt 
> alignment.  DON'T EVEN TRY TO TUNE JUNK!
>
> I'll try to get this stuff posted to my website soon. 
> http://www.skywaves.ar88.net/commrx/RME/RME.html
>
> Good luck,
> Al
>
> On 4/14/2013 10:58 AM, Bill Carns wrote:
>> I am doing my first alignment of a RME 69 receiver.
>>
>> I am having trouble reading the schematic in the area of the crystal 
>> filter
>> but there is apparently some confusing info.
>>
>> There is not much in the manual about the switch positions for the filter
>> selector switch. In the alignment section it refers to the middle 
>> position
>> of the switch as the "Series" mode position.....fine.
>>
>> That implies that there is a "Parallel" mode position...  ??? Maybe.
>>
>> There appear to be three positions of the switch..   10:00, 12:00 
>> (Series)
>> and 2:00.   But, in the schematic there appear to be only two positions 
>> and
>> it is not clear what the wiring is in each position, or which position it 
>> is
>> shown in..
>>
>> I want to understand this guy before I leap in.
>>
>> Also, anyone out there have any words of wisdom for setting the C and 
>> C(c)
>> capacitors that appear to be a "factory Setting on Band one, but "Should 
>> be
>> kept to an absolute minimum, so as not to degrade the upper bands.
>>
>>
>> 75 years later, I am not sure I trust the "factory" settings for C and 
>> Cc,
>> which could have shifted or been messed with along the way.
>>
>>    Any   ....  HELP !  is appreciated.
>>
>> Bill
>> N7OTQ
>>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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