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 Post subject: Heathkit Grid Dip Meter GD-1B
PostPosted: Jan Sun 20, 2019 6:10 am 
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Joined: Jul Mon 11, 2016 5:54 pm
Posts: 310
Location: Lansdale,PA 19446
Well, Here is a couple of pictures of mine.. Meter than Dial..


Image


Image


I took completely apart.. And put back together


Ok Back together.. Seems to work Well a Little bit.. It will Osc and put out frequencies.. Quite Stable

But When I turn the Sensitivity control all the way Clockwise I can only get it to Read Grid current About 1/2 way Between pegged to left and 0..

Voltages measured..

115 DC after Rectifier
110 DC After 1K ohm resistor

Pin1 of tube 81 Volts DC
Pin 2 of tube -15 Volts

Any clue why almost no grid current on meter??

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 Post subject: Re: Heathkit Grid Dip Meter GD-1B
PostPosted: Jan Sun 20, 2019 8:11 am 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 10911
Location: Powell River BC Canada
VECHER wrote:
Well, Here is a couple of pictures of mine.. Meter than Dial..


Image


Image


I took completely apart.. And put back together


Ok Back together.. Seems to work Well a Little bit.. It will Osc and put out frequencies.. Quite Stable

But When I turn the Sensitivity control all the way Clockwise I can only get it to Read Grid current About 1/2 way Between pegged to left and 0..

Voltages measured..

115 DC after Rectifier
110 DC After 1K ohm resistor

Pin1 of tube 81 Volts DC
Pin 2 of tube -15 Volts

Any clue why almost no grid current on meter??

Skip

Voltages at rectifier a tad high,perhaps because the selenium rectifier
as replaced with a silicon diode.

Pin 1 voltage should be 45-52 volts.

This should not affect meter circuit since pot current
is some what constant.

Suggest checking resistors up steam of the phone jack contact
and make sure the 10 K pot isn't open end to end.

Wiring in this kit is tricky, make sure no errors.
Attachment:
Heath GD 1 B.jpg
Heath GD 1 B.jpg [ 136.91 KiB | Viewed 313 times ]

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VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
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 Post subject: Re: Heathkit Grid Dip Meter GD-1B
PostPosted: Jan Sun 20, 2019 9:57 pm 
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Joined: Jul Mon 11, 2016 5:54 pm
Posts: 310
Location: Lansdale,PA 19446
Ok, Fixed.. I went over it checking every connection and every wire.. I missed a connection..After putting wire where it was supposed to go I now have Grid current.. The OSC still works and is very Stable on counter.. Next to check to see if I can measure a circuit.. Have to make up a Resonant circuit..

So so far so good..

Skip


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 Post subject: Re: Heathkit Grid Dip Meter GD-1B
PostPosted: Feb Sat 16, 2019 2:17 am 
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Joined: Jul Mon 11, 2016 5:54 pm
Posts: 310
Location: Lansdale,PA 19446
Well I can get a dip Not very good and circuit has to be inside the antenna.. if put it close by nothing Any clue to what could be wrong?

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 Post subject: Re: Heathkit Grid Dip Meter GD-1B
PostPosted: Feb Sat 16, 2019 12:35 pm 
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Joined: Oct Sun 15, 2006 12:57 pm
Posts: 6189
Location: Liberty, Missouri
What antenna are you talking about?
---------------
As you progressively move the coil of the dip meter closer to the resonant circuit, the dip will become deeper. As you get quite close, you will find the meter dips at two close, but different frequencies. You want to get a single dip, which is fairly deep, but stable. Such a dip will allow you to obtain a fairly accurate frequency reading.

If you feel the need to be very precise, you can use a pick-up loop of a few turns, like the one one the left, connected by a cable to your counter to determine what the exact frequency is.

Image

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 Post subject: Re: Heathkit Grid Dip Meter GD-1B
PostPosted: Feb Sat 16, 2019 1:09 pm 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 10911
Location: Powell River BC Canada
There are two extra coils for the GD-1B that extend the frequency
down to broadcast band frequencies.

Grid dip meters were intended for ham band frequencies and the
construction that was done in the tube days.

The sharpness of the dip depends on the coupling to the coil being tested.

The meter kit came with some extra blank paper dial inserts for use with
extra coils or special applications.

Here are the two extra coils.

40-51 A,600 to 1900 khz and 40-51 B, 350 to 700 kHz.


Attachments:
HEATH GD 1B LOW FREQUENCY COIL SET 350 TO 700 AND 600 TO 1900 KHZ.JPG
HEATH GD 1B LOW FREQUENCY COIL SET 350 TO 700 AND 600 TO 1900 KHZ.JPG [ 49.29 KiB | Viewed 111 times ]

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca
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