🚀 go-pugleaf

John Larkin wrote:
> On Thu, 25 Jun 2009 13:17:58 -0700, Joerg <invalid@invalid.invalid>
> wrote:
> 
>> John Larkin wrote:
>>> On Thu, 25 Jun 2009 19:50:09 GMT, Rich Grise <richgrise@example.net>
>>> wrote:
>>>
>>>> On Wed, 24 Jun 2009 22:01:51 -0700, John Larkin wrote:
>>>>> On Wed, 24 Jun 2009 21:42:07 -0700, <castlebravo242@att.net> wrote:
>>>>>> "David L. Jones" <altzone@gmail.com> wrote in message 
>>>>>> news:h8B0m.53620$FI5.3564@newsfe12.iad...
>>>>>>> Check out a rather unusual phenomenon you can see on your oscilloscope in 
>>>>>>> my latest blog (#14):
>>>>>>> http://www.alternatezone.com/eevblog/
>>>>>>> See if you can get it to happen on your scope!
>>>>>>> I'll offer a free subscription to my blog for the best screen shot posted 
>>>>>>> :->
>>>>>>>
>>>>>>> Oh, and the probe doesn't have to be shorted either.
>>>>>> When I worked a Century Data we had a problem with our new reel to reel 
>>>>>> vaccuum column tape drive when ever someone would walk by the drive when it 
>>>>>> was reading it would get data errors. The problem was that the shield on the 
>>>>>> cable from the heads to the preamp was grounded on both ends.
>>>>> That's usually the best way to ground shields.
>>>> When I was a kid, my brother built a Heathkit TOOB amp; in the low level
>>>> circuits, they only ever grounded one end of the shields.
>>>>
>>> Inside a steel chassis pan, it wouldn't matter. But then Heathkit was
>>> hardly an authority on signal management.
>>>
>> Now wait a minute, they engineered darn good stuff. The old HW100/101 
>> transceivers were among the best ever made back in the tube days. Still 
>> got one. No noises or buzzes whatsoever and its performance in the 
>> vicinity of strong signals is stellar. The only not so good thing was 
>> the two rubber pulleys because they cooked out too fast, but you could 
>> keep a stash of them in the drawer.
> 
> Toob amps didn't rectify RF as well as silicon does.
> 

But:

We used such transceivers in multi/multi type ham radio contests and 
field days. There you had to deal with another 100W transmitter blasting 
into an antenna maybe 100ft away. You could make a light bulb glow on 
the other antenna. Many transceivers fell off the rocker there, the only 
ones that always performed were the super-expensive Collins line and the 
Heathkit at the budget end of the price scale. If their signal 
management wasn't up to snuff this would never have worked.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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