[Hallicrafters] good neutralization method

[Greg Mijal]

Sure

If you have a spectrum analyzer you can see the magnitude and frequency 
(ies) of the oscillation.  It's creepy to watch if the N of the circuit is 
way off and the tube(s) is going nuts. It can be a really powerful 
phenomenon under the right circumstances and is easily capable of destroying 
a sweep tube.
What's typical for a serious case is the plate meter doing weird things. 
Such as bouncing around when it should be showing only idle current and very 
steady.  A good place to check N is at the top of the Ten meter band.  If 
you dip the plate and the power goes up, even slightly then you are not 
experiencing the run away amplifier turned part-time oscillator syndrome. If 
the N is ok on 10m the rest of the bands are going to be OK.
73's
Greg
WA7LYO
in sunny Feenix
----- Original Message ----- 
From: "Ziegenbein, Randy" <rziegenbein at volcanocorp.com>
To: "Steve" <zarco at sonic.net>; <hallicrafters at mailman.qth.net>
Sent: Monday, February 05, 2007 2:23 PM
Subject: RE: [Hallicrafters] good neutralization method


Hi group,

I was wondering if someone would mention the signs your xmitr exhibits
when the finals are not neutralized.

73, Randy, K6RCZ


-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Steve
Sent: Saturday, February 03, 2007 8:30 AM
To: hallicrafters at mailman.qth.net
Subject: [Hallicrafters] good neutralization method

Hi Folks,
A while back I posted here saying I was having a difficult
time neutralizing the finals in my HT-44. Received lots of help
and suggestions from the folks here. It turned out that the problem
was the neut cap was badly mistuned. The best method to tune
it was found in the 1964 ARRL handbook, and here's what
it said to do;

The information contained in this electronic message and any attachments to
this message may contain information that is privileged, confidential, or is
otherwise protected by work product immunity. If the reader of this message
is not the intended recipient, or an employee or agent responsible for 
delivering
this message to the intended recipient, you are hereby notified that any
dissemination, distribution, use, copying, and/or discloser of its contents 
is
strictly prohibited. If you have received this message in error, please 
notify us
immediately by either replying to this message or calling Volcano 
Corporation
at +1 (800) 228-4728 and, deleting this message from your computer.


______________________________________________________________
Hallicrafters mailing list
Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:Hallicrafters at mailman.qth.net
----
List Administrator: Duane Fischer, W8DBF **for assistance**
dfischer at usol.com
----
Hallicrafters Collectors International: http://www.w9wze.org