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Call Sign : 26-CT-4316 Posts : 21 Times Thanked : 1 Join date : 2021-10-31 QTH or Location : Redcar Equipment Used : Yeasu 450d
Subject: Gainmaster 5/8 Fri Jul 15, 2022 6:32 pm
Hi guys just a quick one Siri gainmaster 5/8 is it pre tuned and cannot be tuned And what the swr like across the band atu and not 20m up to 6m please
Alan Pilot Major contributor
Call Sign : 163-CT-220...MW7TTA Posts : 2351 Times Thanked : 60 Join date : 2019-11-19 QTH or Location : Anglesey North Wales Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+. Age : 149
I wouldn't start pulling the 'wire' up through the top ferrule for fear of over tightening the antenna cabling/connections and the manual states as such to prevent damage. I think Alan may have been referring to the Gainmaster HW (half wave) which can be tuned by such methods and although you probably could adjust it with some jiggery-pokery it probably isn't recommended. (A look at the manual will show you this is a more complicated antenna than a simple wire with a capacitive connection as well as matching stub.)
As ever there are the typical complications surrounding operator installation. Much depends on how high it is installed, whether near metallic objects, quality of coax cable used by you for connection, how long the coax is with losses incurred, etc. etc.
Also it will depend on what you find is an 'acceptable' SWR.
The manufacturer states a SWR range of 2:1 (25.5MHz - 30MHz) which most radios can easily handle and is actually a 90% or better efficiency.
As you make mention you could probably load it almost anywhere with an appropriate ATU/Matcher but gaining an acceptable SWR doesn't necessarily make it a good antenna.
Hope that helps.
All the best, Victor
Alan Pilot Major contributor
Call Sign : 163-CT-220...MW7TTA Posts : 2351 Times Thanked : 60 Join date : 2019-11-19 QTH or Location : Anglesey North Wales Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+. Age : 149
Subject: Re: Gainmaster 5/8 Sat Jul 16, 2022 7:59 am
oop's yes it was the halfwave i had. Still have it but lost the inner wire when the old greenhouse was taken down to make way for the new shack.
Victor likes this post
Victor CT Directors
Call Sign : 26-CT-3228 / M7VIC Posts : 5166 Times Thanked : 323 Join date : 2019-11-10 QTH or Location : Bedford Equipment Used : Various
Subject: Re: Gainmaster 5/8 Sat Jul 16, 2022 8:50 am
No worries Alan mate, doesn't help that Sirio called them both 'Gainmasters'.
Just thought I'd clear that up a bit in case you get the old "but you said".......
Alan Pilot and Tristar like this post
Dave_P New Member
Call Sign : 26-CT-9718 Posts : 11 Times Thanked : 0 Join date : 2022-04-17 QTH or Location : Walsall Equipment Used : Midland Quarantotto, FT-991A, IC-7400, TS200-X, IC-7100, IC705, FTM300, FT-817, IC-E92D, ID52E. Age : 57
Subject: Re: Gainmaster 5/8 Mon Oct 03, 2022 11:53 pm
ive had the 5/8 wave gainmaster since they came out. Its been mounted on a 6 meter pole that whole time with no issues at all. It covers from 24.65 upto 30.3 mhz all below 1:5:1. without any ATU or other form of matching.
And for some reason it also tunes on 4m without an ATU although i cant say performance is any good.
Today at 6:49 am by bobbyssantaponsa
Subject: Gainmaster 5/8 
