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1. Topband: Hi Z amplifiers for 160m (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Wed, 11 Mar 2020 11:33:34 +0000
As well as being a radio amateur (G4HYG) I also run a small business designing and making radio equipment (Cross Country Wireless). Recently I've been asked by a radio contest group to see if I can r
/archives//html/Topband/2020-03/msg00109.html (7,425 bytes)

2. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Wed, 11 Mar 2020 18:31:25 +0000
Thanks for all the very helpful replies and suggestions. I'll change the BNC connector to a 4 hole F connector with 75 ohm output. The design already has a 20 kA gas discharge tube and DC biased diod
/archives//html/Topband/2020-03/msg00118.html (8,280 bytes)

3. Re: Topband: Hi Z amplifiers for 160m (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Thu, 12 Mar 2020 10:10:44 +0000
Thanks again for all the comments. Very interesting especially the reasoning behind the designs. The device I've picked for my design is the LTC6228. This is a new device by Analog Devices that only
/archives//html/Topband/2020-03/msg00128.html (8,223 bytes)

4. Topband: Loop on the ground as a counterpoise (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Mon, 4 May 2020 09:57:35 +0100
I've developed a High Z Antenna Amplifier for 160m and other HF use as previously mentioned on the list. Usually these would be used with a ground rod and 5m vertical element. With the lockdown it's
/archives//html/Topband/2020-05/msg00009.html (8,533 bytes)

5. Topband: Loop on the ground as a counterpoise - update (score: 1)
Author: Chris Moulding <chrism@crosscountrywireless.net>
Date: Tue, 5 May 2020 22:26:27 +0100
I've modeled two versions of the High Z Antenna Amplifier with a 5m vertical element one with a 10m long loop counterpoise and the other with a 10m straight counterpoise. My version of 4NEC2 with NEC
/archives//html/Topband/2020-05/msg00018.html (7,202 bytes)

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