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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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17th Mar 2016, 5:56 pm | #1 |
Tetrode
Join Date: Sep 2004
Location: Plumstead, London, UK.
Posts: 76
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Wobbulator
Has anyone got a circuit of a wobbulator for AM IFs. Preferably valves that I could make-up from the junk box. ta.
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taxitony |
17th Mar 2016, 6:03 pm | #2 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: wobulator
You might be able to extract the relevant bits of the circuit from the book of words for the Radivet:
http://www.pa3esy.nl/meetinstrumente...cs/radivet.pdf Simpler means might be available elsewhere. Lawrence. |
17th Mar 2016, 6:12 pm | #3 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: wobulator
There's also the Jason Kit wobb, schematic and manual in this thread:
http://vintage-radio.net/forum/showthread.php?t=93126 I haven't looked for any more. Lawrence. |
17th Mar 2016, 6:58 pm | #4 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,171
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Re: Wobbulator
Hi Tony, there was a good design in radio Bygones some years ago. If you contact them they may have the back numbers or copies.
Ed |
17th Mar 2016, 8:29 pm | #5 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
Posts: 1,453
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Re: Wobbulator
If that's the one from April/May 2003, Ed, it uses obsolete Toko coils which are likely to prove difficult to find.
— Joe |
17th Mar 2016, 10:17 pm | #6 |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,737
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Re: Wobbulator
Someone on the forum asked me about the RF Haigh one which featured in Radio Bygones, and I advised him that the coils are no longer made and unlikely to be obtainable. I suggested that there was an outside chance that Peter Thomas at Jabdog might have the coils. The forum member PM'd me to say that Peter does in fact have sets of coils, but how many, I've no idea.
For anyone who does decide to build one (or maybe already has), there is a wiring error, in that the coils for ranges three and four are wired up as ranges four and three. I only discovered this when checking the converge of the ranges and found that range three showed up as the highest band. That design also uses a varicap diode that isn't very commonplace and Jabdog can supply that too.
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David. BVWS Member. G-QRP Club member 1339. |
18th Mar 2016, 1:41 am | #8 |
Octode
Join Date: Jul 2004
Location: Evesham, Worcestershire, UK.
Posts: 1,415
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Re: Wobbulator
Been toying with getting a raspberry pi for a while and the wobkit looks like just the thing to motive me to do it, it's great.
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18th Mar 2016, 8:02 am | #9 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
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Re: Wobbulator
There is a range of replacement coils for Toko coils available here. Down near the bottom of the page.
http://www.spectrumcomms.co.uk/Components.htm Terry VK5TM |
18th Mar 2016, 8:46 am | #10 |
Pentode
Join Date: Jul 2006
Location: Bedfordshire, UK.
Posts: 211
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Re: Wobbulator
Tony,
I bought one of the Jason kit WII valve wobbulators mentioned earlier in this thread at an auction quite a few years ago. On receipt it wasn't working on one of the ranges, but that was soon fixed. Sometime afterwards I built one of the Raymond Haigh designed units as published in the Radio Bygones magazine. As such the Jason kit WII valve wobbulator is now really surplus to my requirements. [It hasn't been used for quite a while now so I would need to power it up and check that it is still working OK.] Without wishing to dissuade you from home-brewing one you would be welcome to have the Jason kit WII valve wobbulator for £25, plus any delivery costs. (I have the manual for it which includes the circuit diagram and parts list.) If you are interested at all please drop me a PM and we can discuss further. Best regards, Richard |
18th Mar 2016, 12:09 pm | #11 |
Tetrode
Join Date: Sep 2004
Location: Plumstead, London, UK.
Posts: 76
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Re: Wobbulator
Hi Richard, thanks for the offer. I am very interested in purchasing your Wob. Perhaps your run it up for me. Please keep me informed. thanks Tony
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taxitony |