I have successfully used crystals from International Crystal in Oklahoma
City for crystals for my R4B. They knew the specifications. Their website
is: www.icmfg.com.
Charles Staples
WB5ZNV
----- Original Message -----
From: "Walter Amos" <[email protected]>
To: "Drake List" <[email protected]>
Sent: Tuesday, December 03, 2002 11:02 AM
Subject: [Drake] Can anyone help me with this ? Fw: CRYSTAL INQUIRY
> 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
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