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| IMAX v Homebrew GM; OMG. | |
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| Tweet Topic Started: Sunday, 2. February 2014, 17:12 (1,637 Views) | |
| Kaos | Sunday, 2. February 2014, 17:12 Post #1 |
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13 Charlie Tango 013
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Just put up my homebrew Gainmaster as I was a bit peeved about other stations near me hearing more than me. Well what a huge surprise........ No S5 noise floor and I can hear all sorts of things. Good things like voices that I wouldnt normally hear. Cept the ones in my head. The AE of choice before was an IMAX2K and this has convinced me never to put up fibreglass again. I fell off my chair when I plugged it in. Its a dream. No S5 noise during the day (garage lights I think). If filmed it on the 2 Grants with AM and LSB and they are both clear as crystal. I am hugely impressed by it. Thats a recording in the summer after I made it. Edited by 13CT025, Sunday, 2. February 2014, 19:48.
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13CT013 Tim aus Germany So Mote it be | |
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| 13CT025 | Sunday, 2. February 2014, 17:59 Post #2 |
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I wonder if what they say is in agreement with what mine tell me. ![]() |
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| Lowflyer | Sunday, 2. February 2014, 18:35 Post #3 |
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108 Charlie Tango 036
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If the ones in your head told you to make a psychedelic pot belly pig avatar George then I very much doubt it. Luv your HBGM Tim, great that its working so well now ! top job. Nothing more satisfying than a homebrew when it works as well as the commercial kit. ! top job! LF |
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108CT036 "Some People are so Poor, all they have is Money!" UNIQUE CHARLIE TANGO UK FM CONTACTS - 74 Stations Worldwide -----> LIVE BROADCAST ON USTREAM <----- | |
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| Cozzmik | Sunday, 2. February 2014, 19:23 Post #4 |
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Tim you say "never put up fibreglass again" but isnt your hbgm fibreglass? While ive heard many say the fibreglass antennas (a99,imax etc) are noisey ive never actually seen this here at my qth (i use an a99 amongst others),as i have a s0-s1 max unless theres a storm over head when its been known to rise to s3 max. Good to see it works well for you in your location
Edited by Cozzmik, Sunday, 2. February 2014, 19:27.
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| Kaos | Sunday, 2. February 2014, 19:29 Post #5 |
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13 Charlie Tango 013
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Ahhhhh I see where you are going Sam. The pole (made from fibreglass) is just for support. The GM is zip tied to it. There is a defo difference and I had to check my connections a few times. It works and is staying put. |
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13CT013 Tim aus Germany So Mote it be | |
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| Cozzmik | Sunday, 2. February 2014, 19:34 Post #6 |
26 Charlie Tango 465
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Cheers for the info matey,well it certainly seems to work in your qth and thats all that matters.Ive tried various antennas over the years and tbh ally,fibreglass and even a copper j pole all received similar levels of noise here.... Isnt it nice to have a low noise floor and hear those back of the box stations
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| Kaos | Sunday, 2. February 2014, 19:36 Post #7 |
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13 Charlie Tango 013
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Wait till the vid uploads. Eye opener for me. |
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13CT013 Tim aus Germany So Mote it be | |
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| EKaye1971 | Sunday, 2. February 2014, 20:23 Post #8 |
26 Charlie Tango 2781
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well done tim for the homebrew beating the imax and getting less static.static is a post code lottery and anyone who gets s1 and less lucky lol .i get s3 to 7 so you need a s9lus to hear anyone anyways il get off my sop box now lol
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| BigTone | Sunday, 2. February 2014, 20:49 Post #9 |
26 Charlie Tango 4498
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Melodies heard are sweet. Noise unheard even sweeter! |
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| Mudslinger | Sunday, 2. February 2014, 21:16 Post #10 |
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I did try an Antron here once and I did get quite a lot of noise on it compared to a metal 5/8 wave. However during my first CB stint in the early 1990's I ran an Antron with no noise problems. So it could be just a modern interference thing or even just the location. |
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| EKaye1971 | Sunday, 2. February 2014, 21:42 Post #11 |
26 Charlie Tango 2781
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exactamundo i remember getting s3 noise max in the mid 80s and being off lol with a thunderpole 2 pre computer and plasma days . oh yes there were zx81s and the like but i dont think they interfered
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| 13CT025 | Sunday, 2. February 2014, 22:39 Post #12 |
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Yay, I'm first ![]() Video: "President Grant 1 and President Grant 2 ASQ on homebrew Gainmaster." by Tim |
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| Cozzmik | Monday, 3. February 2014, 07:41 Post #13 |
26 Charlie Tango 465
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I get exactly the same noise floor as you on my a99,sigma 4,t2lt,hori dipole and 2 ele and it makes working those back of the box stations easier for sure!. So as we know location is a factor here but tbh the first test only showed a slight difference in noise between the two antennas but you say in your latest video that there is a big difference and who am i to dispute,most importantly your hbgm works well I will say the g2 isnt a patch on the g1 for rx quality in my opinion but i was brought up on 80s radios so my ears are more accustomed to this sound. But you`ve saved me a few notes as i wont be buying the g2,my superstar 360 sounds far better
Edited by Cozzmik, Monday, 3. February 2014, 08:00.
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| MadMark1 | Monday, 3. February 2014, 11:14 Post #14 |
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163 Charlie Tango 020
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I have no noise with my A-99.... its up about 20 ft.... For a real comparison try using the same radio, As different radios different RX... etc... To make a real comparison it really needs to be the same radio... I would rather watch the difference then, As its on the same radio... But good on you for building one a giving it a go... Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Mudslinger | Monday, 3. February 2014, 12:07 Post #15 |
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You can say that again Mark.
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| 13CT025 | Monday, 3. February 2014, 14:15 Post #16 |
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Yes. Probably it is best to analytically have a look at the things which could (!, not must!) have an influence on the noise which is being picked up, and on the way the noise is being perceived by the operator. The following, long list is only supposed to show that there are many things:
I've surely missed a few things in this list. Summary:
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| 163ct034 | Monday, 3. February 2014, 16:56 Post #17 |
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Looking at the both video's to me it seems your Imax seems to pulls in more static at your location than mine myself i think it all depends on where the antenna is located at your end myself back in the 1990s used to run a antron A99 for many years with great contacts all over the globe with no noise problems lovely antenna. I see many on here would would slag off! the A99 and refer to it as a large dummy load! knowing what a dummy load is the A99 doesn't seem to work that well as one being that it would transmit a signal imho tongue in cheek! but getting back to the Imax 2000 I have one up here and i'm in the middle of a large city i don't get any static with mine here I have been reading all the fab reports of the gain master so i bought one and to be honest my I-max pulls in a stronger signal by about 2 s points with both antennas at 50 feet next to each other both are good but my i-max 2000 beats my gainmaster thats my pounds worth! you pay your money you take your chance
Edited by 163ct034, Monday, 3. February 2014, 17:09.
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163-CHARLIE TANGO #034 CITY & COUNTY OF SWANSEA ON THE SOUTH WESTERN COAST OF WALES! | |
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| The DB | Monday, 3. February 2014, 17:05 Post #18 |
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Just to expand on George's post, there seems to be in some areas a "blanket" of noise above houses, especially in city/suburb environments. If your antenna is in this area above the houses you tend to get more noise than if it is above or below that area. I have heard others mention this and have experienced a phenomena like it myself. I have seen this not only at HF frequencies, but as high as the 440 MHz Ham Radio band. The DB |
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| The DB | Monday, 3. February 2014, 17:07 Post #19 |
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Have you considered swapping their locations? The DB |
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| MadMark1 | Monday, 3. February 2014, 17:47 Post #20 |
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163 Charlie Tango 020
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Thats the other point that the DB has mentioned... Trying both antennas in the same location... Same coax etc... Ive tried antennas here... and found one to be much better against another... Swapped them over and the good antenna is now down on the other.... Huh... You get reflections, Anything metalic will effect the antenna... etc...In the end i took mine upon the mountain and tried Them there.... Lol... This is what makes antennas and antenna building so fascinating... Keep up the good work... Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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well done tim for the homebrew beating the imax and getting less static.static is a post code lottery and anyone who gets s1 and less lucky
lol .i get s3 to 7 so you need a s9lus to hear anyone anyways il get off my sop box now lol


but getting back to the Imax 2000 I have one up here and i'm in the middle of a large city i don't get any static with mine here I have been reading all the fab reports of the gain master so i bought one and to be honest my I-max pulls in a stronger signal by about 2 s points with both antennas at 50 feet next to each other both are good but my i-max 2000 beats my gainmaster thats my pounds worth! you pay your money you take your chance
8:47 AM Jul 11