Homebrewing a Sirio Gainmaster using RG58 and 2.5mm wire.

The place to talk about specific radios, equipment and accessories. Do you prefer the latest generation of rigs and antennas or do you like the classics? Discuss it here!
Post Reply
adrian
Radio Addict
Radio Addict
Posts: 679
Joined: 07 Jun 2007, 11:26

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
Registered New User
Registered New User
Posts: 2
Joined: 24 Jun 2015, 15:28
Location: West Yorkshire

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
Regular
Regular
Posts: 9
Joined: 13 Jun 2013, 10:48

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
You do not have the required permissions to view the files attached to this post.

teoneo
Registered New User
Registered New User
Posts: 2
Joined: 01 Dec 2015, 22:49
Call Sign: peter161

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 :)

teoneo
Registered New User
Registered New User
Posts: 2
Joined: 01 Dec 2015, 22:49
Call Sign: peter161

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

User avatar
CBCharlieST
Regular
Regular
Posts: 10
Joined: 29 Jan 2013, 00:05
Call Sign: 9a3csq
Location: Croatia

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/

43cs44
Regular
Regular
Posts: 9
Joined: 16 Jan 2014, 06:37
Call Sign: 43cs44

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
Regular
Regular
Posts: 6
Joined: 03 Jul 2018, 09:52

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.

User avatar
Kaos
Radio Addict
Radio Addict
Posts: 953
Joined: 14 Nov 2007, 06:53

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.

User avatar
Nasa
Registered New User
Registered New User
Posts: 2
Joined: 08 Jun 2018, 20:47

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

User avatar
PsiDOC
Super Member
Super Member
Posts: 446
Joined: 16 Aug 2011, 18:39
Call Sign: 163FKU
Location: Moonbase Alpha
Contact:

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

Post by PsiDOC » 09 Nov 2018, 20:39

MY goodness.
Is this thread still alive?
I am humbled.
*Proud owner of a Cornflake Packet Amateur License and registered instructor in the art of gaining said license*
Icom IC-756 Pro III
Yaesu FT100D.
President Washington
President Adams
Tait T2020 70mhz
Baofeng UV-5R 2m / 70cm

User avatar
MrWeetabix
Admin
Admin
Posts: 14302
Joined: 26 Aug 2008, 13:34
Call Sign: 26TM175
Location: Tynemouth

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

Post by MrWeetabix » 12 Nov 2018, 11:02

Can I just thank all the contributors to this thread. This is exactly why TM1 is here, to provide information, guidance and support for other hobbyists.

This information would be pretty much lost on a social media platform or on a chat board, but this thread will be searchable on this forum, and therefore via google, for (hopefully) many years to come, allowing those whom follow us into this hobby to recreate this fantastic project and get some real enjoyment and satisfaction from their hobby.

So again, I thank you all. You guys are what makes this forum so good.
26TM175. OP: Craig. QTH: Tynemouth. Also 163TM175 when mobile in Wales 8)

PO Box: 62 Town: Albrighton City: Wolverhampton Zip: WV7 3WR

TM1 is now on Facebook http://tinyurl.com/TM1onFB || New Tango Mike QSL cards https://tinyurl.com/TM1-NewQSL

Post Reply

Who is online

Users browsing this forum: No registered users and 13 guests