Re: [Boatanchors] Navigator and Heathkit A-1 Meters

[Garey Barrell]

Gary -

Replace the meter..   The AT-1 has a three position meter switch, Grid-Off-Plate to 
eliminate the noise once tuned up, I don't know about the Navigator.


--
73, Garey - K4OAH
Rome, GA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs


Gary Franklin wrote:
Is there a solution for snubbing/taming  the meter action on the Johnson Navigator and 
Heathkit AT-1 meters?


Gary

K8BKB



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Re: [Boatanchors] Navigator and Heathkit A-1 Meters

[Al Parker]

Well, shazaam --
	There's an article by WB4OGM in the latest (Oct. 16) ER that describes 
the AT-1 meter in detail, but (I haven't read it in detail) doesn'tseem 
to fix the old gripe other than to say that in the AT-1, at least, there 
is one switch posn that disconnects the meter.  He say that it's not 
really a "moving vane" meter as is usually claim, but is a "moving 
magnet" movement, but they both have about the same characteristic 
overshoot.
	IIRC several of the early Heath xmtrs had the same type meter, I built 
one of the first DX-35's and griped abt it then.

73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 10/14/2016 11:16 AM, Wilson Lamb wrote:

Capacitor?
WL

-Original Message- From: Gary Franklin Sent: Friday, October 14,
2016 10:55 AM To: Boatanchors Subject: [Boatanchors] Navigator and
Heathkit A-1 Meters
Is there a solution for snubbing/taming  the meter action on the Johnson
Navigator and Heathkit AT-1 meters?

Gary

K8BKB

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Re: [Boatanchors] Navigator and Heathkit A-1 Meters

[rgroh]

Probably not (well, other than putting a better meter in!!).  I also find the 
meter banging around to be a real PITA but, in my mental musings, I haven't 
thought of any way to tame the beast. You could use an RC network (sort of a 
slow attack quick discharge) but that would take some fiddling around with.  
Basically you have, in the meter, a mechanical system with a 'huge' amount 
of overshoot.  You hit the meter with a quick shot of current and it goes way 
over and then settles back to the right reading.  The ONLY way to cure that is 
to slow down the current rise. Then, of course, you have to worry about the 
what happens when the drive current goes down - you don't want to have too much 
'hang'.  Plus the next part of the problem is that meter resistance is fairly 
low - so you are limited in how much R (as part of your RC network) you can put 
in series with meter.  So the R needs to be a low value.  Which means the C 
needs to be big'ish. I thought about playing around with this on the bench but 
... well, just one more thing I won't get to. 
73Bob Groh, WA2CKY 

On Friday, October 14, 2016 9:55 AM, Gary Franklin  
wrote:
 

 Is there a solution for snubbing/taming  the meter action on the Johnson 
Navigator and Heathkit AT-1 meters?

Gary

K8BKB

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Re: [Boatanchors] Navigator and Heathkit A-1 Meters

[oldradio]

   Switch a resistor = to meter resistance in series so meter moves 50%.
   Could be done with mini relay activated when transmitting .

   73, John -- Sent from my Tablet
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Re: [Boatanchors] Navigator and Heathkit A-1 Meters

[Wilson Lamb]

Capacitor?
WL

-Original Message- 
From: Gary Franklin 
Sent: Friday, October 14, 2016 10:55 AM 
To: Boatanchors 
Subject: [Boatanchors] Navigator and Heathkit A-1 Meters 

Is there a solution for snubbing/taming  the meter action on the Johnson 
Navigator and Heathkit AT-1 meters?


Gary

K8BKB

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