Ah .................. GOD just spoke ! Thanks everyone for the info and =
help, will check IC and JAN .
Thanks again.
Walt k8cv
----- Original Message -----=20
From: Bill Frost=20
To: 'Walter Amos'=20
Sent: Tuesday, December 03, 2002 12:58 PM
Subject: RE: CRYSTAL INQUIRY
Dear Walter,
Thanks for the e-mail. The R-4 receiver will require Parallel =
resonant crystals, 27.5 pf load cap., Fundamental or 3rd overtone, HC-6 =
holder.
Regards,
Bill Frost
Service Manager
-----Original Message-----
From: Walter Amos [mailto:[email protected]]
Sent: Tuesday, December 03, 2002 12:18 PM
To: Drake Support
Subject: Fw: CRYSTAL INQUIRY
Can you help me give her the info she need to make some Xtals for my =
R-4, this is the old original one.
Are these fundamental xtals or 3 rd overtone? I sure don't know. Do =
you have any of these. What are they called as the pins are small , not =
like the big pins of the xtals I am used to that we used back in the =
DARK AGES !
best,
Walt
----- Original Message -----=20
From: Barbara Thompson=20
To: Walter Amos=20
Sent: Tuesday, December 03, 2002 11:38 AM
Subject: Re: CRYSTAL INQUIRY
Dear Walt:
We have manufactured for many units of Drake Amateur equipment but we =
have conflicting info from various customers as far as the Load =
Capacitance which is why the customer must state that. If all the =
frequencies you listed are the exact crystal frequencies then I do not =
understand the 12.600 or 17.100 being 3rd Overtones as I have not seen =
3rd Overtone crystals this low in frequency before (have seen them down =
to 21.0 Mhz). =20
We do not manufacture 3rd Overtone crystals below 30.000 Mhz at all so =
I don't think I can help you on any except the 39.100 Mhz. Your info =
shows parallel resonant - but I would still need the Load Capacitance =
(## pF).
If you want to call me at the toll free number (800-252-6780) I will =
be happy to try to make sure we are understanding correctly.
Thank-you
Barbara
----- Original Message -----=20
From: Walter Amos=20
To: Barbara Thompson=20
Sent: Monday, December 02, 2002 3:29 PM
Subject: Re: CRYSTAL INQUIRY
Hi Barb:
it says ...........
IMPORTANT: Only parallel resonant third overtone crystals designed =
for a Miller oscillator should be used.
it also saye ..............
In order to determine the correct crystal frequency , simply add =
11.1 to the lowest frequency of the 500 KC range to be covered. For =
example; assume you wanted to receive 1.5 to 2.0 Mc for reception of the =
160 meter amateur band. The crystal frequency would be the lowest =
frequency of the desired range (1.5 Mc) plus 11.1 which would equal 12.6 =
Mc. This crystal can then be inserted in any one of the ten accessory =
crystal sockets provided.
I also see in the manual ................
Crystals for the high frequency oscillator are of the parallel =
resonant third overtone type and should have a calibration tolerance of =
.001% to insure sufficient vernier tuning on highest frequencies.=20
But this may be refering to fixed frequency operation, not sure ! I =
don't want that kind of xtal as it plugs into the side of the black box =
rig, I want the kind with small wire pins that plug into the 10 =
individual 2 pin slots in the back.
Aparently you have never sold Crystals to hams with old DRAKE TWINS =
before ?
INTERESTING !
Walt
----- Original Message -----=20
From: Barbara Thompson=20
To: [email protected]=20
Sent: Monday, December 02, 2002 2:25 PM
Subject: RE: CRYSTAL INQUIRY
Dear Walt:
I received your inquiry for crystals below. You will need to =
verify the Load Capacitance and the following information before I can =
quote price and availability on these items.
1) 12.600 Mhz. (for 160 meters ham). Fundamental crystal - =
Customer must state Load Capacitance - typically 30pF or Series =
Resonant.
2) 39.100 Mhz. (for 10 meter cw ham) 3rd Overtone crystal - =
Customer must state Load Capacitance - typically 32pF or Series =
Resonant.
3) 21.1000 Mhz (for 30 meter ham) Customer must state =
Fundamental or 3rd Overtone crystal as well as Load Capacitance - =
typically 30pF, 32pF or Series Resonant.
4) 17.100 Mhz (for 49 meter swl) Fundamental crystal - =
Customer must state Load Capacitance - typically 30pF or Series =
Resonant.
I will be happy to quote price and availability when you provide =
the information requested above.
I MUST HAVE A DAYTIME PHONE NUMBER WHERE I CAN EITHER SPEAK WITH =
YOU OR LEAVE A MESSAGE BEFORE I CAN ENTER AN ORDER FOR YOU.
Please send further information to my direct e-mail address =
([email protected]).
Thank-you
Barbara
<><><><><><><><><><><><><><><><><><><><><><><><>
SSSSSSSS Barbara Thompson
SSSSSSSS
SSSSSSSS Sentry Manufacturing Co.
SSSSSSSS P.O. Box 250 (1201 Crystal Park)
MMMMMMMMM Chickasha, OK 73023
C C
C C PH 800-252-6780 * FAX 405-224-8808
C C www.sentrymfg.com * [email protected] =
<><><><><><><><><><><><><><><><><><><><><><><><>
***********************************************************
Company: K8CV
Name: Walt Amos
Email_address: [email protected]
Telephone: non pub
Manufacturer: Drake
Model_Number: R-4 Receiver
Element_Icon_Number: 12.6 Mc. for 160 meters ham
Crystal_Part_Number: 39.1 Mc. for 10 meter cw ham
Tx_Frequency: 21.1 Mc for 30 meter ham
Quantity_Tx: 1 of each
Rx_Frequency: 17.1 Mc for 49 meter swl
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