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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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21st Nov 2021, 11:43 am | #21 |
Hexode
Join Date: Dec 2018
Location: Lugo, Spain
Posts: 483
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Re: Pencil leads as RF resistances
Ah Ok then.
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13th Dec 2021, 12:00 pm | #22 |
Hexode
Join Date: Dec 2018
Location: Lugo, Spain
Posts: 483
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Re: Pencil leads as RF resistances
Finally got round to posting images . Here are some images of the 3 db attenuator build .
Going by the SWR meter it indeed does show a 50% drop in o/p power so the pencil lead does work. QRP only though but i did take it up to 20W I/P. Cheap 0.8mm ali from a double glazing builders workshop as an off cut for the case. |
13th Dec 2021, 12:18 pm | #23 |
Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,533
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Re: Pencil leads as RF resistances
Nice. Well done.
Just don't ever use complete pencils though if it's going to get hot. I did once, in my misbegotten youth. My two-pencil 'arc lamp' caught fire and singed the living room carpet. My dad wasn't best pleased. Steve
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https://www.radiocraft.co.uk |
13th Dec 2021, 12:28 pm | #24 |
Hexode
Join Date: Dec 2018
Location: Lugo, Spain
Posts: 483
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Re: Pencil leads as RF resistances
Well it was born out desperation and what i could press into service based on past knowledge, and some basic metal bashing skills.
Deffo QRP Hi Hi. Hope the carpet wasnt the Axminster LOL. |