Date: Thu, 02 Apr 2009 09:09:07 +0200
To: rsgb_lf_group@blacksheep.org
From: Rik Strobbe <rik.strobbe@fys.kuleuven.be>
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Subject: Re: LF: QRSS / beacon test on 503.7kHz
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Hello Mike,

I am using a "clone" of the M0BMU design. It is a 4MHz ceramic 
resonator VXO, divided by 8 to get 500kHz.
It tunes the entire 501-504 band (in fact 500-505) and after some 
warming up it is reasonable stable (drift of less than 10Hz/hour).
As it was meant for CW QSO's there was no need for further 
stabilization, I am sure that with some kind of temperature control 
stability could be improved significantly.
Actually the frequency stability is best at the lower band end (large 
tuning capacitor), so 503.7kHz is not optimal.
I noticed that the VXO drifted up about 30Hz from 21:30utc till 
05:30utc, during this period the shack temperature dropped from 22C 
to 14C (thus about 4Hz/C)

73, Rik  ON7YD - OR7T

At 00:13 2/04/2009, you wrote:
>Hi Rik,
>
>What kind of resonator are you using? There has been talk of using 
>ceramic resonator's on HF beacons but some question if they can be 
>tamed down to stay put on freq. Are you using a crystal heater on 
>that resonator?
>
>Mike
>WE0H
>/16
>
>
>
>Rik Strobbe wrote:
>>Dear all,
>>
>>I just started a QRSS10 beacon on 503.7kHz (right now 503.705 but 
>>it might drift down some Hz over the next hours).
>>The beacon will start every 15 minutes at +6 minutes (so xx:06, 
>>xx:21, xx:36 and xx:51) and the message takes about 7,5 minutes.
>> From +6:25 to +6:30 it will be "key down" for the "blue trace" on 
>> the G4GWT beacon monitor.
>>ERP is about 200mW
>>
>>73, Rik  ON7YD - OR7T
>>
>>Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>>
>>


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