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 Post subject: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 12:14 am 
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When I was introduced to the world of Amateur Radio in 1982, I was also introduced to a very simple but useful piece of test equipment.

The Grid Dip Oscillator or Grid Dip Meter.

My "Elmer" had a Knight G-30 which he used quite often. I decided I wanted one too, so at the first hamfest I went to, I found a Heathkit GD-1B.
It worked, but I was quickly disillusioned with it as unlike the Knight G-30, you couldn't move the hairline to calibrate it on the fly.
I also had a difficult time with the dial wheel dragging against the case because it had warped.

So, I kept my eye out for a Knight G-30 and soon found one!

Soon I discovered there were better GDOs made and over time, I started collecting them.

So, after Mike (mikeinkcmo) asked me how many I have, I decided to take photos and show the variety of them Ive found.
A few of which are home brew of varying quality.

First is my Knight G-30. I know I still have that Heathkit GD-1B, but it is in a box buried where I can't quickly get to it.
Attachment:
knight_g-30-gdo.jpg
knight_g-30-gdo.jpg [ 435.19 KiB | Viewed 1997 times ]


An EICO 710 which I found after the Knight, which showed me some could reach lower frequencies.
Attachment:
eico710gdo.jpg
eico710gdo.jpg [ 384.29 KiB | Viewed 1997 times ]


A PACO G-15 another kit grade GDO with low frequency coils and a moveable hairline.
Attachment:
paco_g-15_gdo.jpg
paco_g-15_gdo.jpg [ 556.79 KiB | Viewed 1997 times ]


A Millen 90651 which I learned many considered to be the Cadillac of GDOs. My boss at the TV shop ended up getting one for free with the low frequency coils.
I was quite envious, but I've since found a couple of them! :D One LF coil isn't shown in this photo.
Attachment:
millen-gdo.jpg
millen-gdo.jpg [ 608.45 KiB | Viewed 1997 times ]


Once I joined ARF, I learned about the Measurements 59 MegaCycle Meter. It was mentioned that a few here consider it superior to the Millen?
Alan Douglas also mentioned he had a full set in a velvet lined case. Well, at Hamvention 2014, I found one! I also found a standalone 59LF. Needless to say they were my only purchases that year.
Attachment:
measurements-megacycle-meter-in-case.jpg
measurements-megacycle-meter-in-case.jpg [ 603.55 KiB | Viewed 1997 times ]

Attachment:
measurements59-lf.jpg
measurements59-lf.jpg [ 381.98 KiB | Viewed 1997 times ]


Before I knew about the MegaCycle Meter I did find this military AN/PRM-10 manufactured by Stamford Electronics Co. in Connecticut. It covers 2-400 MC.
Attachment:
military-gdo.jpg
military-gdo.jpg [ 474.84 KiB | Viewed 1997 times ]


Not long ago, I started picking up solid state GDOs I guess the name didn't change even though you aren't measuring grid current anymore.
Here is a Heathkit HM-10A "Tunnel Dipper" not in the best condition though. It uses a Tunnel or Esaki Diode as the oscillator.
Attachment:
heathkit-hm10a.tunnel-dipper.jpg
heathkit-hm10a.tunnel-dipper.jpg [ 334.27 KiB | Viewed 1997 times ]


The last Heathkit GDO is the HD-1250 which is a very attractive looking piece of equipment! I need to find a coil for this one.
Attachment:
heathkit_hd-1250-gdo.jpg
heathkit_hd-1250-gdo.jpg [ 505.61 KiB | Viewed 1997 times ]

Attachment:
heathkit-gdo.jpg
heathkit-gdo.jpg [ 275.77 KiB | Viewed 1997 times ]

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 12:19 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Wayside, NJ Monmouth
My set up so far


Attachments:
Millen_GDO_ANT_Bridge.jpg
Millen_GDO_ANT_Bridge.jpg [ 224.05 KiB | Viewed 1994 times ]
Finds.jpg
Finds.jpg [ 197.15 KiB | Viewed 1994 times ]
File comment: I Built the one on the right, then found an original.
Tone Modulator.jpg
Tone Modulator.jpg [ 473.25 KiB | Viewed 1994 times ]
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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 12:20 am 
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Location: Dayton Ohio
More of them I have found along the way.

A Barker & Williamson 600 which is an unusual looking one.
Attachment:
bwgdo.jpg
bwgdo.jpg [ 484.11 KiB | Viewed 1993 times ]


A Caywood branded Millen Solid-State model 90652
Attachment:
caywood-millen-gdo.jpg
caywood-millen-gdo.jpg [ 421.54 KiB | Viewed 1993 times ]


A Kenwood DM-81, which I have no coils for. Maybe I'll find them someday.
Attachment:
kenwood_dm-81.jpg
kenwood_dm-81.jpg [ 281.3 KiB | Viewed 1993 times ]


A Lafayette 99-2503 and a Leader LDM-810 both of which I have no coils for... :(
Attachment:
lafayette-leader-gdos.jpg
lafayette-leader-gdos.jpg [ 434.85 KiB | Viewed 1993 times ]


Three Lafayette TE-18s Why do I have three? Not sure. I'm missing one of the coils which I have somewhere.
Attachment:
lafayette_te-18.jpg
lafayette_te-18.jpg [ 620.49 KiB | Viewed 1990 times ]


Lysco Dipmaster which uses a resistance line cord.
Attachment:
lysco-dipmaster.jpg
lysco-dipmaster.jpg [ 471.98 KiB | Viewed 1990 times ]


Midland 23-120 Japanese made GDO
Attachment:
midland-gdo.jpg
midland-gdo.jpg [ 580.79 KiB | Viewed 1990 times ]


Here are three home made GDOs
Attachment:
homemadegdo1.jpg
homemadegdo1.jpg [ 654.88 KiB | Viewed 1990 times ]

Attachment:
homemadegdo2.jpg
homemadegdo2.jpg [ 762.42 KiB | Viewed 1990 times ]

Attachment:
homemadegdo3.jpg
homemadegdo3.jpg [ 598.42 KiB | Viewed 1990 times ]


Each with varying degree of quality.

-Steve

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Last edited by azenithnut on Jan Sun 05, 2020 12:27 am, edited 1 time in total.

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 12:20 am 
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That's quite an impressive dipper collection! I think you've posted all the ones I own, which is really only about 4 lol. I've never used one.

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 12:29 am 
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Thanks Barry, and N2LXM,
I never thought you guys would be so on-the-ball to post before my second post.

Only 10 images are allowed in one comment :D

-Steve

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 12:31 am 
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Oh, one more, but I question whether it qualifies.

I think it was a home made GDO, but I only have part of it.

-Steve


Attachments:
homemadegdo4.jpg
homemadegdo4.jpg [ 209.74 KiB | Viewed 1989 times ]

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 1:44 am 
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Wow that looks like an old National Velvet Vernier dial with 5:1 reduction. Or one of the competitors. They were the thing for many home brew radios.

I don't think that's from a GDO. I would expect interchangeable coils.

Bob


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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 2:12 am 
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Nicely done spread Steve, THAT is a very impressive collection.

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 3:00 am 
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Mike, Thanks! I have a few others in duplication or hard to get at for the moment. Those TE-18s were all laying together, so I just photographed them all together :)

Bob, it is indeed a National type B dial assembly.

Here are a couple different views. It has two socket connections where plug-in coils would go.

With an Acorn and handle, I suspect the meter would be in a stationary unit much like the Megacycle Meter.

This part is all I have.

-Steve


Attachments:
homemadegdo4a.jpg
homemadegdo4a.jpg [ 396.31 KiB | Viewed 1950 times ]
homemadegdo4b.jpg
homemadegdo4b.jpg [ 391.34 KiB | Viewed 1950 times ]

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 4:56 am 
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Nothing exciting but I restored it electrically. Works good but not very useful (for me) unless you are building tuned circuits. Missing one coil.
.


Attachments:
IMG_1708.JPG
IMG_1708.JPG [ 154.43 KiB | Viewed 1917 times ]

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 6:19 am 
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I love that the acorn tube is soldered right into the circuit. No socket needed!
They must have had a real light touch with the iron.


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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 2:30 pm 
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A couple photos of my home brew GDO :-)


Attachments:
gdo.jpg
gdo.jpg [ 66.24 KiB | Viewed 1868 times ]
gdo2.jpg
gdo2.jpg [ 81.57 KiB | Viewed 1868 times ]
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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 3:15 pm 
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Wow, that is nicely built!

Thanks for sharing! Did you follow plans from an article or design it yourself?

-Steve

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 3:30 pm 
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My contribution to this gathering of grid-dip oscillators ...

Image
... is another Heathkit HD-10-A Tunnel Dipper.

Image
It uses a tunnel diode as the active device in the oscillator.

Image
The oscillator level is metered by a circuit composed of a few transistors driving a D’Arsonval meter.

Image
The top originally contained a foam cushion for the coils, but that disintegrated long ago.

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Last edited by stevebyan on Jan Sun 05, 2020 3:34 pm, edited 1 time in total.

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 3:32 pm 
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Steve, here's some info on your missing the high frequency coil for your Heathkit GD-1250 Grid Dip Oscillator.

Image
Perhaps you can fashion a replacement from the photos.

Image
The coil is a single-turn hairpin loop.

Image
The coil is about an inch long, if you subtract the threaded portion of the RCA phono plug.

Image
The coil is shaped something like the end of a cotter pin. The straight side is soldered to the shield of the RCA phono plug. The other side has an S-curve that brings the loop in to meet the center pin of the PCA phono plug.

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 4:11 pm 
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azenithnut wrote:
Wow, that is nicely built!

Thanks for sharing! Did you follow plans from an article or design it yourself?

-Steve


Thanks for the kind words :-)

The plans for the circuitry came from a Linsday Impoverished Radio Experimenter publication.
But, the mechanics and graphics were my creation :-)


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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 4:16 pm 
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No wonder they are so hard to find, YOu have them all! But I have managed to pick up 3-4.
I believe one of the books, "The Impoverished Radio Experimenter", has plans for a DIY GDO.

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 10:58 pm 
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I'll jump in too.

I've got a Heathkit GD-1B, Eico 710, two Millen's and this.
OK it's not old but it is a dip meter.

Al


Attachments:
DSCN5147_cr.jpg
DSCN5147_cr.jpg [ 284.54 KiB | Viewed 1788 times ]

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 11:00 pm 
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Thanks Al, I forgot about that accessory on the MFJ-259.

I have one too, but forgot to add it. Thanks for reminding me. :D

-Steve

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 Post subject: Re: Show us your Grid-Dip meters (GDOs)
PostPosted: Jan Sun 05, 2020 11:08 pm 
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Glad I could help, I need to be reminded a lot these days. :?

azenithnut wrote:
Thanks Al, I forgot about that accessory on the MFJ-259.

I have one too, but forgot to add it. Thanks for reminding me. :D

-Steve

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