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Old 20th Feb 2024, 11:58 pm   #1
Julesomega
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Default Was this homebrew sig gen made from a kit?

I found this and took it home, it looks as though it could be useful. It looks quite professional from the outside except it doesn't have any brand or type legend. The impression is that the front panel and PCB may have been supplied as a kit, so I'm wondering if anyone recognises it. Maybe from a magazine article? The frequency range 150kHz – 12MHz looks a bit homebrew.
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Old 21st Feb 2024, 1:57 am   #2
Terry_VK5TM
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Default Re: Was this homebrew sig gen made from a kit?

Last picture, hiding under the bottom of the variable cap - is there a number or some text on the pcb?
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Old 22nd Feb 2024, 9:38 am   #3
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Default Re: Was this homebrew sig gen made from a kit?

This should answer your question, ignore the panel design.
https://www.vintage-radio.com/projec...generator.html
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Old 22nd Feb 2024, 9:57 am   #4
David G4EBT
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Default Re: Was this homebrew sig gen made from a kit?

And for conclusive proof, here's the PCB:

https://www.vintage-radio.com/images...g-gen-pcb2.gif
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Old 22nd Feb 2024, 12:14 pm   #5
Terry_VK5TM
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Default Re: Was this homebrew sig gen made from a kit?

Good to see it identified.

Personally, I would be leaving out the ground plane - there's too many isolated bits that could act as capacitors between tracks for my liking.
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Old 22nd Feb 2024, 1:04 pm   #6
Julesomega
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Default Re: Was this homebrew sig gen made from a kit?

Thanks so much for finding the original article, which I note is credited to Paul Stenning.
It looks even more useful now I have the schematic and details of a mod to increase the frequency range. When I took the photos I got out the old faithful frequency meter which decided to call it a day and now the sig gen has gone into hiding, but when I find it I shall try it out properly.
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Old 22nd Feb 2024, 6:02 pm   #7
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Default Re: Was this homebrew sig gen made from a kit?

Soon found, sealed in a bag and awaiting attention. It hadn't been tried because the internal mains PSU had been replaced by a DC connector with no clues as to voltage or polarity. Running on a bench supply it is sweet, frequency stability beyond reproach; blowing into the enclosure briefly shifts it a few tens of Hz. The opening comments on the linked page, about harmonic levels, applies to the modulation osc rather than the RF O-P which is probably better than most RF generators in terms of harmonics. The modulation osc certainly needs taming, and switching off when not in use; modulation is 100% square wave when 'on', reducing significantly when 'off'. The top range needs adjusting, otherwise calibration is good.

To bring this to a really useful state will need a pointer dial to give some idea of frequency without needing an external counter.
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Old 28th Feb 2024, 12:17 am   #8
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Default Re: Was this homebrew sig gen made from a kit?

Guilty m’Lud
So that’s where it went!
Apologies for the rather poor standard of the internal construction.
Front panel was probably done with that fiddly Photosensitive anodised Ali stuff since I think it was made before we got the laser engraver at work….
Hope you find it useful Jules
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