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Author Topic: heathkit DX-20 meter  (Read 1480 times)
K9MOV
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Posts: 39




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« on: March 30, 2014, 01:01:26 AM »

Need a meter for the DX-20 transmitter or info on a replacement.
Thank you,
Lane-K9MOV       K9MOV@ AOL.COM
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W9GB
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Posts: 2468




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« Reply #1 on: March 30, 2014, 10:16:09 AM »

Lane --

Do you have the original meter?
Repairs or usage of a replacement movement, in the old case, can be discussed
with RAM Meter in Troy, MI.
http://www.rammeter.com/contact-us

Heathkit DX-20 Schematic diagram.
http://www.vintage-radio.info/download.php?id=52

As I remember, Heath used a Shurite meter movement, 1 mA ??
The later Heath-kit DX-35 used a 3 mA, 500 ohm meter movement (Heath #407-33).
This is likely identical part used in DX-20 .

http://pdf.textfiles.com/manuals/SCANNERS-F-R/Heathkit-dx-35.pdf
===
Meters in amplifiers or transmitters are the same. Plate or grid current meters almost always read voltage developed across a shunt resistance, while high voltage is measured by measuring current flowing though a series-connected multiplier resistance.

Meters in Old Tube Transmitters, W8JI
http://www.w8ji.com/metering_amplifier.htm
« Last Edit: March 30, 2014, 11:06:46 AM by W9GB » Logged
K9MOV
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Posts: 39




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« Reply #2 on: March 30, 2014, 05:25:30 PM »

Thank you for that information. Unfortunately the meter was destroyed before I got the radio.( basket case off of E-bay-- paid more for shipping then radio--HI) I thought the power transformer was fried, but after rebuilding power supply and clearing a B+ short, all OK. I have much more wiring cleanup to do. ( I think it was used on 11 meters and they tried to put plate mod on it) Many other poor mods done which I have restored to original.
I bought this for parts, but now see it as a challenge to get it restored.
In the last 2 years I have done a Johnson navigator, drake 2b, S-53, ARC 5-BC-453 and still have a Globe scout 65a waiting after the DX-20. ITS FUN!!! Thanks again for the info and I'll figure something out with the meter.

Lane--K9MOV
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W9GB
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Posts: 2468




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« Reply #3 on: March 30, 2014, 08:34:55 PM »

Tom, WBJI has a web page for his Globe Scout 65a restoration, and modifications.
http://www.w8ji.com/globe_scout_page.htm

Tom also shows the repair steps for the 1 mA, 50 ohm (Ideal Precision Meter)
D'Arsonvol meter movement from Heathkit DX-60 transmitter.
http://www.w8ji.com/Repairing%20heathkit%20meters.htm
« Last Edit: March 30, 2014, 08:45:36 PM by W9GB » Logged
K9MOV
Member

Posts: 39




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« Reply #4 on: March 31, 2014, 10:35:48 AM »

Thanks for the GOOD info. As I mentioned, the original meter is trash and not repairable-- so will be looking for some type of replacement.
Thanks again for the info, it is very helpful.
Lane-K9MOV
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W9GB
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Posts: 2468




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« Reply #5 on: March 31, 2014, 03:41:32 PM »

Lane -

I asked about the original meter case, since you can often just insert a replacement meter movement into that case.
Some restorers desire to maintain the "look and feel" of the original (avoid looking like a bad hack).

Hoyt Electrical Instrumentation (New Hampshire)  is the largest mfg. of
analog meter movements in North America.
http://www.hoytmeter.com/products/accessories/meter-movements/32/meter-movements-detail

Specification Sheet
http://hoytmeter.com/images/catalog/product/analogpanel_metermovements.pdf

Analog meter repair shops routinely do this type of work.  
There were a couple of shops in Chicago area and RAM Meter in Troy, MI is radio amateur managed.
« Last Edit: March 31, 2014, 03:49:34 PM by W9GB » Logged
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