Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

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adrian
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by adrian » 14 Jun 2015, 11:16

I wonder how many people have made one of these gainmasters? and have not actually mentioned it.
I made one up yesterday,after receiving westflex 103 via a propper courier,,in other words it got here in one piece.
only problem i had was the connection of the matching stub , a little bit of a pain to do.Needed some heat on that thick coax!!!
swr is 1.7. not bad for a starting point!.swings about in the breeze quite nicely.
Also noticed less static,in other words the s7 of rubbish has gone!
A big thankyou to the peeps who done all the leg work and all the calculations, :-) :D
ADE

caketin
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by caketin » 24 Jun 2015, 16:48

Hi does anyone have the hi res piccys of the build that PsiDOC created for the gain master?
The links are dead and was interested in the build.
If anyone could help, it would be appreciated

caketin

kamikazeandi
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by kamikazeandi » 05 Dec 2015, 16:37

Hello,
I've modified the dimensions of my last 2 GM a bit. I built them for 2 HAM-friends. I built all coax-parts with RG-213. The upper radiator is made of flexible Cu-Wire with PVC-isolation. The dimensions for best SWR for me were at the end of testing (with "MY" RG-213):
GainMaster-Construction_RG-58_RG-213_en.gif
And I've turned the choke 90°, so that the RG-213 "flows" more smoothly in the choke as you can see below (grey = GFK-Mast & black = GM):
GainMaster am Mast.gif
Hope that helps a bit to build one yourself with RG-213.

kamikazeandi
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teoneo
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by teoneo » 05 Dec 2015, 19:50

Thank You Andi ! When i do my own ,I will tell how it works :)

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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by teoneo » 26 Dec 2015, 22:00

Hi Guys !
My SWR is 1.2 on 26 MHz and 1.6 on 30 MHz . Thanks for all 73

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CBCharlieST
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by CBCharlieST » 28 Mar 2016, 16:27

Hi Guys,
In front of us is a new challenge! Gain Master half wave 5560 mm or 11.2 feet.

http://www.sirioantenne.it/hf-base/gainmaster-hw/

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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by 43cs44 » 21 Oct 2016, 09:49

I think they posted their dimensions wrong, My calculator says 5560mm = 18.24 feet .
Think "Half wave flowerpot antenna" built for 27 megs

transit2500
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by transit2500 » 11 Aug 2018, 18:58

bringing this back up . i made one this week but swr will not come down2.5 i dont understand the capacitor i have done the 25mm then took braid away then from the top one up 10mm and took some braid away to for a tag then i connected to that the top wire .everything i have done as in the aticle can some one show me how to do the capacitor 8.3pf whick mst be the 10mm bt i could be wrong.... up date re worked capacitor after somone showed me how to make one just got to put it up today and tune
Last edited by transit2500 on 12 Aug 2018, 12:00, edited 1 time in total.

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Kaos
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by Kaos » 12 Aug 2018, 07:49

adrian wrote:
14 Jun 2015, 11:16
I wonder how many people have made one of these gainmasters? and have not actually mentioned it.
I made one up yesterday,after receiving westflex 103 via a propper courier,,in other words it got here in one piece.
only problem i had was the connection of the matching stub , a little bit of a pain to do.Needed some heat on that thick coax!!!
swr is 1.7. not bad for a starting point!.swings about in the breeze quite nicely.
Also noticed less static,in other words the s7 of rubbish has gone!
A big thankyou to the peeps who done all the leg work and all the calculations, :-) :D
ADE
I got round that by using PL plug T-pieces. Less work and easier to put up n take down.

Noise floor dead and 25 to 30 Mhz Swr is in green working range.

Nasa
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Re: Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

Post by Nasa » 13 Aug 2018, 06:38

If you need more input you may check out this forum web site:

https://funkbasis.de/viewtopic.php?f=15 ... &start=690

There are a lot of pictures and diagrams regarding DIY Gain-Master.
Discussion is in german but english posts will be answered and welcome as well.

Regards,
Lothar

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