[Heathkit] Re: Heathkit IM-4180 FM deviation meter

[Dick KF4NS]

Problem solved. The meter movement is a 200ua FS and there is no 
shunt. It basically acts as a direct reading voltmeter. this was 
uncovered by Keith Harvey VA3KRV - VE3KHV who went to lengths to 
substitute a meter of known value and made tests for comparison. I owe 
it all to him, whart a guy! The same movement is used in several other 
test equipments like the Heathkit VTVMs.
Thanks to all who responded.
73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!

----- Original Message ----- 
From: "Dick KF4NS" <kf4nsradio at verizon.net>
To: <HEATH at LISTSERV.TEMPE.GOV>; <heathkit at mailman.qth.net>; "Test 
Equipment" <test-equipment at mailman.qth.net>
Sent: Monday, April 16, 2007 7:35 PM
Subject: Heathkit IM-4180 FM deviation meter


>I forgot who all responded to me earlier but anyone who has one of 
>these and has the schematic would you please, if you can, first check 
>the meter and see if  (1) you see any markings on the lower meter 
>scale that show DC voltage markings, and (2) if there are any 
>indications of a FS value on the movement.
>
> Also, I need some help with the schematic in determining the shunt 
> resistance for the meter. I tried to follow the path through the 
> many switches and their various positions but still cannot determine 
> the shunt value on the negative side of the movement. Since my meter 
> shows no FS value and the meter is broken, I may have to substitute 
> a movement.
>
> Any help would be greatly appreciated.
> Thanks and 73, Dick KF4NS
> St Petersburg, FL 33714 USA
> Keep The Glow!