[Lowfer] xtal osc heater

[Michael Sapp]

John & Mike:  Take a look at the Khune QH40A  40deg C precision crystal 
heater on the DB6NT site....

73 Mike wa3tts


----- Original Message ----- 
From: "John Andrews" <w1tag at charter.net>
To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Monday, November 10, 2014 8:06 PM
Subject: Re: [Lowfer] Frequency usage question


> Mike,
>
> I understand. The various beacons I have run have all had exciters inside 
> the shack. The TAG transmitter presently on the air from Maine is an 
> extreme example, with a very nice 10 MHz proportional oven oscillator. But 
> it was designed to run in an unheated building (next to a lake in the 
> winter), and to also have a WOLF mode that requires high stability. There 
> are a number of less demanding possibilities, such as gluing a thermistor 
> to the crystal can (see: 
> http://www.lowfer.us/k0lr/all-in-one/all-in-1.htm ). I got by for a long 
> time by having a box within a box with styrofoam insulation between the 
> two. Of course, that was again inside the shack.
>
> That graphical ID thing that Bill had was quirky, and needed to be tweaked 
> periodically. Do remember that he ran plain old QRSS30 or 60 for quite a 
> while before that, until he noticed that slanted "waveforms" seemed to be 
> more noticeable by eye. You might want to start with QRSS, and let things 
> develop from there. That way, the guys would have something familiar to 
> look for. Just a thought.
>
> John, W1TAG
>
> On 11/10/2014 7:40 PM, N8OOU wrote:
>> John, thanks for the captures from your archive. The Wm exciter will 
>> operate based on a switch selectable R/C oscillator or crystal that is 
>> pulled by a control voltage.
>> In trying to understand the circuits, I wondered if the signal would 
>> drift as it does not have any "environmental control" other than the 
>> metal case. In my testing I could impart a small frequency change by just 
>> breathing on the oscillator area.  I may need to change where I planned 
>> to locate the exciter.
>>
>> 73   de   N8OOU - Mike Meek
>>
>> On 11/10/2014 05:45 PM, John Andrews wrote:
>>> Charlie,
>>>
>>> I'm not sure that both attachments will make it through, but WM.jpg is a
>>> shot of what the signal looked like over the air. WmVD.jpg is a shot of
>>> Wm and VD (Jay, W1VD), again over the air. In that picture, "800"
>>> represents 185.300 kHz. Bill generally tried to keep the bottom of the
>>> Wm on 185.300, but as you can see from looking at the rig, it ain't an
>>> atomic standard...
>>>
>>> John, W1TAG
>>>
>>>
>>> ______________________________________________________________
>>> Lowfer mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/lowfer
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Lowfer at mailman.qth.net
>>> Post must be less than 50KB total for message plus attachment!
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>> ______________________________________________________________
>> Lowfer mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/lowfer
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Lowfer at mailman.qth.net
>> Post must be less than 50KB total for message plus attachment!
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
> Post must be less than 50KB total for message plus attachment!
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html