[Boatanchors] HP 606 vs. 608

[Carl]

Since when does any HP counter use a free running oscillator for the 
basic unit?

Carl
KM1H


----- Original Message ----- 
From: "Richard W. Solomon" <w1ksz at earthlink.net>
To: <boatanchors at qth.net>
Sent: Wednesday, February 11, 2009 7:58 PM
Subject: Re: [Boatanchors] HP 606 vs. 608


>I wouldn't trust a frequency counter with a free-running reference 
>oscillator
> unless you have a way to calibrate it. If you use a GPSDO and the 10 
> MHz output
> as your counter reference you are in pretty good shape.
>
> 73, Dick, W1KSZ
>
> -----Original Message-----
>>From: "James A. (Andy) Moorer" <jamminpower at earthlink.net>
>>Sent: Feb 11, 2009 7:52 PM
>>To: boatanchors at qth.net
>>Subject: Re: [Boatanchors] HP 606 vs. 608
>>
>>Indeed, using a generator with dinky little output transistors to feed 
>>an
>>unknown piece of equipment is asking for trouble. Feeding something 
>>with a
>>606 or 608 which have vacuum-tube followers on 150-volt power supplies 
>>will
>>take just about anything you can give it - and may fry whatever you 
>>try to
>>connect it to.
>>
>>Indeed, the 606 makes a great VFO, although the output may be a bit 
>>hot for
>>your use, and, as noted before, you will want to use it with the 8708
>>synchronizer to keep it from drifting off the edge of the band. A .01 
>>in the
>>line never hurt anything. Similarly, you may want to put a frequency 
>>counter
>>on it to see exactly where you are. The 608 has two outputs - one 
>>isolated
>>output before the attenuator that can go right into a frequency 
>>counter, and
>>the other after the attenuator that can go to the crystal input.
>>
>>James A. (Andy) Moorer
>>www.jamminpower.com
>>
>>----- Original Message ----- 
>>
>>> Be very careful. I was once working on a transmitter and needed VFO 
>>> input.
>>> Hooked up my  Hi Tech HP Signal Generator and found I was pumping 
>>> voltage
>>> from the transmitters Osc stage back into the Signal Generator. Blew 
>>> out a
>>> proprietary output chip on the generator and hence destroyed it. Not
>>> happy!!
>>> Lesson for me is that I ALWAYS put a .01 mfd cap in the line of my
>>> generator
>>> now.
>>>
>>> Mark V Johnson VE3DJU/VE3DDI
>>> ----- Original Message ----- 
>>> From: "Barrie Smith" <barrie at centric.net>
>>> To: <boatanchors at qth.net>
>>> Sent: Wednesday, February 11, 2009 6:44 PM
>>> Subject: Re: [Boatanchors] HP 606 vs. 608
>>>
>>>
>>>>I have a 606A.
>>>>
>>>> I've been thinking of using a small rice-box as a VFO for my
>>>> HT-4B/BC-610.
>>>>
>>>> I wonder if the 606A would work well as a VFO for the transmitter?
>>>>
>>>> I would be feeding the output of the 606A into the crystal socket 
>>>> on the
>>>> tuning unit.
>>>>
>>>> Any thoughts?
>>>>
>>>> 73, Barrie, W7ALW
>>>>
>>
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