Date
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G3WDG Filters for 2 mtr to 10GHz receiver
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Dennis_G6YBC
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Robin Szemeti - G1YFG
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Dennis_G6YBC
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Hi Dennis
somewhere in the shed ..put away for a rainy day ..I have 2 of the round filters ? Which have a screw in the top for adjustment…believe they were soldered to the board …does this sound like what your after ….they are the genuine parts still in the bag …may take a day or so to re discover them . -- Steve G4HTZ JO01JN60 Great Wakering, Essex 24ghz 1.8w 80cm dish also known to be active occasionally on 70cms DATV
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Andy MM0FMF
Maybe a dumb question but are the sizes not in the instructions? I remember there was a section about how to cut and mount the probes that solder to the PCB. I'm fairly sure they'll be a standard pipe cap size and the top was drilled and tapped for an M4
tuning screw with lock nut.
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Dennis_G6YBC via groups.io <g6ybc@...>
Sent: Monday, January 17, 2022 12:59 AM To: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Subject: Re: [UKMicrowaves] G3WDG Filters for 2 mtr to 10GHz receiver
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Robin Szemeti - G1YFG
Hi Andy, No they were turned from brass and silver plated, with a thicker top section for a bit more "purchase" for the M4 screw. I have a lathe and some brass bar, and I even have some filters ... but they are all soldered down so unable to measure the internals. I did however fix my DDK004 last night (having finally taken the last child back to uni) .. its only taken me 25 years or so to get around to that!
On Mon, 17 Jan 2022 at 09:08, Andy <mm0fmf@...> wrote:
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Robin Szemeti - G1YFG
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Chris G8BKE
The dimensions are in the Microwave Handbook Vol 3 ...see attached
73
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Andy MM0FMF
Ah, it's 22 years since I built mine. Thinking now, I remember they were "shiny" and felt heavier than their size suggested.
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Robin Szemeti - G1YFG via groups.io <robin@...>
Sent: Monday, January 17, 2022 1:18 AM To: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Subject: Re: [UKMicrowaves] G3WDG Filters for 2 mtr to 10GHz receiver Hi Andy,
No they were turned from brass and silver plated, with a thicker top section for a bit more "purchase" for the M4 screw.
I have a lathe and some brass bar, and I even have some filters ... but they are all soldered down so unable to measure the internals.
I did however fix my DDK004 last night (having finally taken the last child back to uni) .. its only taken me 25 years or so to get around to that!
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Robin Szemeti - G1YFG
I could turn you some up in brass ... sadly I can no longer silver plate as the fish tank full of cyanide has been deemed to be one the "you're not bringing that thing in the car" items that didn't make it through the last workshop move. How many were you after?
On Mon, 17 Jan 2022 at 09:45, Chris G8BKE <berryway21@...> wrote: The dimensions are in the Microwave Handbook Vol 3 ...see attached --
Robin Szemeti - G1YFG
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Paul G8AQA
Brass would need to be silver plated in view of
the poor conductivity of brass.
15 mm copper pipe caps adjusted to the required length should be quite adequate. Pipe cap filters can be tuned over quite a range. If you have a pipe expander you could increase the internal diameter to 16mm. I doubt whether this would be necessary. If you use a BA screw rather than an ISO Metric you will get a slightly finer adjustment and better thread contact. The contact angle is 47.5 degrees rather than 60 degrees. 73 Paul G8AQA On 17/01/2022 09:45, Chris G8BKE wrote:
The dimensions are in the Microwave Handbook Vol 3 ...see attached
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Gerhard_DK4XP
Hi,
< https://wiki.microwavers.org.uk/G3WDG_Microwave_Designs > has the complete description. You should try if you get by with pipe end caps. The tuning range is huge and you can see what you get without soldering the cap. Slight pressure is enough. Last summer, I have made some measurements, too. But my VNA works only to 8 GHz. < www.hoffmann-hochfrequenz.de/downloads/PipeCapFilters.pdf> Gerhard DK4XP
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Michael Scott
They were made from 3/4 inch brass rod, I know because I made several hundred for Charlie. Initially, I sent them for silver plating, but later on Charlie found that this was not necessary. The need dried up when people found that 1/2 inch copper pipe caps ( Stop ends in the UK ) worked as well. 73, Mike, G3LYP.
On 17/01/2022 09:08, Andy wrote:
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SAM JEWELL
The original pipe caps for the original G3WDG transverter and 001 multiplier were made by Cyril, G3VVB, in his workshop in the west country. We managed to find someone (apologies, forgotten the callsign but lived in the Midlands) to silver plate them for next to no cost. Between them they must have made dozens of 'filters'. I recall that Mike then volunteered to make them when Cyril was no longer able to for health reasons.
toggle quoted messageShow quoted text
73 de Sam, G4DDK
On 17 Jan 2022, at 10:49, Michael Scott via groups.io <g3lyp@...> wrote:
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Dennis_G6YBC
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Andy MM0FMF
Dennis you can just download the info if you are keen to get moving.
I remembered right, the dimensions are in the instructions I received with my kits of parts all those years back. 😉
73
Andy
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Dennis_G6YBC via groups.io <g6ybc@...>
Sent: Monday, January 17, 2022 7:41 AM To: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Subject: Re: [UKMicrowaves] G3WDG Filters for 2 mtr to 10GHz receiver
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Dennis_G6YBC
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I have ..amazingly found the filters and sent Dennis a picture to check it’s what he needs
if not someone else may want them  -- Steve G4HTZ JO01JN60 Great Wakering, Essex 24ghz 1.8w 80cm dish also known to be active occasionally on 70cms DATV
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David Redman
Steve I would be interested if Dennis doesn't want them Dave G4IDR ---------- Forwarded message --------- From: Steve G4HTZ via groups.io <essexsteve=icloud.com@groups.io> Date: Tue, 18 Jan 2022 at 20:09 Subject: Re: [UKMicrowaves] G3WDG Filters for 2 mtr to 10GHz receiver To: <UKMicrowaves@groups.io> I have ..amazingly found the filters and sent Dennis a picture to check it’s what he needs if not someone else may want them  -- Steve G4HTZ JO01JN60 Great Wakering, Essex 24ghz 1.8w 80cm dish also known to be active occasionally on 70cms DATV
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Dennis wants the filters so they are now spoken for
-- Steve G4HTZ JO01JN60 Great Wakering, Essex 24ghz 1.8w 80cm dish also known to be active occasionally on 70cms DATV
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