I don't know what to tell her ! What do they call the small pin xtals the
R-4 needs?
What kind of load capacitance is she talking about ?
Help !
Walt K8CV Royal Oak, MI.
----- Original Message -----
From: Barbara Thompson
To: Walter Amos
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).
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 -----
From: Walter Amos
To: Barbara Thompson
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.
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 -----
From: Barbara Thompson
To: [email protected]
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