[R-390] Y501 Rattles

[Craig]

Roger,

Thanks for the reply. So far it is no dice for ICM & JAN. The crystal from
ICM has 0.030 inch diameter leads about 3/4 inches long. Thinking I might be
able to push those leads thru the crystal holder in Z501. Then bend and
solder with fingers crossed.

The old 455KC crystal has met the mico butane torch for a look see inside.
The Crystal was a small 1/4 inch wafer, seems to be gold plated and was
somehow attached to the two leads. 

A note for those who might ship crystals to others: ICM ships in the small
USPS priority cardboard box. Two layers of bubble wrap are used for a
cushion. So considering the age of original R-390/A crystals, shipping in
just a thin paper bubble wrap envelope is a roll of the dice. I still have
one 200KC crystal that was shipped using the envelope and it arrived with a
rattle. 

No matter the solution for the crystal, R502 & R503 were selected to optimum
bandpass. Just another challenge. First, gotta get something oscillating at
455KHz.

Regards,
Craig

-----Original Message-----
From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Roger
Ruszkowski
Sent: Wednesday, April 13, 2016 10:30 AM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Y501 Rattles


Craig,

The crystal cans can be unsolder and opened.
You can stuff a 455 KHz crystal inside the can and resolder.

I stuffed a couple cans with some no name surplus crystals and they run
close enough for my counter and signal generator to zero with.
As a CW filter and for dial calibration they are good enough.

Roger.
 
 
-----Original Message-----
From: Craig <hamfish at comcast.net>
To: r-390 <r-390 at mailman.qth.net>
Sent: Tue, Apr 12, 2016 10:18 pm
Subject: [R-390] Y501 Rattles

To the list:

The Motorola R-390/A has a rare disease, rattle of the Y501. This is not
good if the receiver is to be placed in a vibrating location. The 455KC
crystal inside Z501 is broke, plain and simple. I see where Fair Radio has
Z501 with crystal/less cover, but have to wonder about the condition of the
crystal? Last week I spoke with ICM (International Crystal Manufacture) and
thought they had the real thing; upon arrival of their crystal the pins were
too small in diameter and way too long. 

Anyone been down this road?

Thanks,
Craig
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