[Lowfer] HC-49 Crystal on 1856 khz

[LEE BAHR]

I guess you could "pull" the crystal slightly too with a cap to change the 
frequency slight. from 185 Khz.  I just looked at my crystals from Dan.  I 
have 6 of them, so maybe they were 6/$1.00.  Can't remember but they cost 
next to nothing and are bright and clean unused with 1 inch leads.

Lee



----- Original Message ----- 
From: "Bill Ashlock" <ashlockw at hotmail.com>
To: <lowfer at mailman.qth.net>
Sent: Thursday, August 05, 2010 8:55 PM
Subject: Re: [Lowfer] HC-49 Crystal on 1856 khz


>
> Lee,
>
> Another advantage to your Xtal approach is that you can add FM modulation 
> to that Xtal osc by simply connecting a series 2pf - 5pf cap to the hot 
> side of the Xtal and a GP rectifier diode to gnd (cath to cap) at the 
> other end of the cap. The modulation is applied via a ~1 meg series 
> resistor to the diode. The diode acts as a poorman's varricap but you will 
> find there is plenty of freq change on a typical QRSS30 screen with a 
> simple 1N400X and will likely have to increase the value the resistor to 
> keep it under a deviation of 1Hz.
>
> Bill
>
>> From: pulsarxp at embarqmail.com
>> To: lowfer at mailman.qth.net
>> Date: Thu, 5 Aug 2010 20:14:17 -0500
>> Subject: [Lowfer] HC-49 Crystal on 1856 khz
>>
>> A short while back I ordered some parts from Dan's Small Parts and Kits.
>> Among other things, he has HC-49 crystals on 1856 khz.  The price is
>> 5/$1.00.  I ordered 5.  They look great but I have not tried them.
>>
>> I was thinking, if you want to make a Lowfer transmitter without an Epson
>> osc, you could use one of these crystals into a divide bye 10 chip and 
>> come
>> out with a Lowfer freq signal.  You can hardly beat 5 for a buck.
>>
>> Lee, w0vt
>>
>>
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