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 half size g5rv on 80

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rabbi
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Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 128
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

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PostSubject: half size g5rv on 80   half size g5rv on 80 Icon_minitimeSat Mar 05, 2022 7:21 pm

hi anyone used a half size g5rv with the feeder straped together as a marconi t antenna with an earth conection for 80 meters i have seen a full size g5rv on 160 meters with some local results thanks for looking have a great weekend paul m0kbd 73s Smile

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RadioWavez
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Call Sign : 2-CT-210
Posts : 30
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Equipment Used : Alinco DX-SR8

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PostSubject: Re: half size g5rv on 80   half size g5rv on 80 Icon_minitimeTue Aug 16, 2022 1:48 pm

I've done this. It's basically a T-antenna or flat-top antenna. These are seen a lot for experimenters on VLF. You need a good earth connection for decent results. It will work OK for local contacts with a poor earth. You may need an external antenna matching unit to tame the transmitter.

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Victor
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Call Sign : 26-CT-3228 Ham M7VIC
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PostSubject: Re: half size g5rv on 80   half size g5rv on 80 Icon_minitimeTue Aug 16, 2022 10:24 pm

I've only recently come across 'flat-top antennas' after looking at pressing my paltry 44 foot doublet antenna into 160m action. (I've managed 80m and making contacts so thought I'd push some more!)

Have knocked together a link-coupled ATU with a fat T200 toroid that gets current up the wire and a 1:1 match but not managed any contact yet on 160m. (The old '1942' boys were booming through though!)

This same setup has been used on 80m by myself and managed to get some FT8 action in the log.
(Couldn't get into the usual rag-chew subject material to try a SSB 'break'.)

The original idea came about after reading this article :-

https://www.dj0ip.de/open-wire-fed-ant/short-antennas/short-80m-antennas/


The shack is upstairs so all I got by adding an 'earth' was terrible noise and the laptop shutting down on transmit. Rolling Eyes  But I have started looking at 'Ground Tuning Units' or 'Artificial Earths' using a counterpoise. So far I can transmit with no ill effects to the shack, (or neighbours!), but my licence limit of 10 Watts hasn't rewarded me as of yet on 160m.


I wish you well with it Paul and thanks to Mike for pointing out such antenna options.


If anyone has anything to share on such subjects it would be most appreciated and should I come up with 'the goods' on my own experiments I'll be happy as usual to share any results/ideas.

Interesting stuff and fits the 'never say never' ethos well. Wink


All the best,
Victor

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