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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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31st May 2020, 4:54 pm | #81 | |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Building A VHF Amplifier For Valve Sets
Quote:
Al. |
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1st Jun 2020, 11:33 pm | #82 |
Dekatron
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
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Re: Building A VHF Amplifier For Valve Sets
I wonder if OldtechFan96 has tried remaking this amplifier on a groundplane yet? It's also worth having a look around to see if there are any noisy battery chargers for laptops/phones nearby. These will limit the benefit of any preamp as they can generate lots of RF interference that the preamp might pick up via the antenna or the preamp wiring or by common mode effects on any coax cable. Even having a computer nearby can cause problems, the cable connection to the computer monitor can also leak interference over a short range and that might spoil things.
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Regards, Jeremy G0HZU |
2nd Jun 2020, 7:25 pm | #83 |
Octode
Join Date: Jul 2017
Location: Newcastle Upon Tyne, Tyne & Wear, UK.
Posts: 1,181
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Re: Building A VHF Amplifier For Valve Sets
The VHF amplifier is in the to do queue at the moment. I will recommence things when I get a better understanding of groundplanes and circuit building.
I think I'm lucky as I've never had issues with computer borne interference. |