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Sirio Gain Master - First report

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Old 04-18-2011, 09:36 AM
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Default Sirio Gain Master - First report

Yesterday I assembled and prepared my Gain Master and Imax 2000 for testing. I decided to skip the A99 as part of the test because I knew it wouldn't compete with the other two and I didn't think we'd gain anything new from including it in the test. Also swapping out two antennas on the same mast was enough fun.

Here was the setup - 24' mast to the bottom of both antennas (used the same mast, same coax, same location, etc).

75 foot run of buryflex to Uniden Grant.

I talked to a local station 15 miles away.

Imax put a solid 6 on his meter, Gain Master a solid 6.5.

Receive - I noticed no difference in my readings.

Noise floor with the Gain Master is slightly quieter than the Imax 2000.

Now here's where it got interesting - with the Gain Master installed the station saw the very slight boost in signal strength but he said I was noticeably louder and CLEARER compared to the Imax.

He said my signal came in with less static and his description of the audio said it sounded like I turned something up.

Now on to the second station - 35 miles distance as the crow flies.

This station did not have a mechanical meter so this test would be only based on "percieved audio" (somewhat less than scientific ). His digital meter (2950DX) showed identical readings for both antennas.

He gave a report that both antennas sounded roughly identical and could not determine any difference.

Those were the only two local stations to test with today but on Thursday night we usually have more stations come out of the woodwork so I can get some additional signal reports.

I also found out this weekend that with the Imax 2000 an elderly neighbor can hear me through her 20 year old TV. I have a low pass installed and I put a high pass on her TV but she can still hear me (first complaint I've ever had in my life from a neighbor).

Tonight I plan to test the Gain Master and see if she can still hear me in the TV which will be a interesting test as well.

Overall it's an interesting antenna. I took lots of close up pictures of the assembly and parts to include when I post my review. I think my first reports show from station to station depending on terrian and other factors antenna performance is very difficult to determine BUT I think once I can get 6 or more reports from different stations I should feel pretty confident in my final analysis of the antenna. I've already raised and lowered both antenna 3 times This next time around I hope to get all the stations on at the same time to save myself some work. Antenna doesn't require any tuning and was 1.1 SWR on my install. I did use a 2 x 2879 inline just to give it a try and the antenna didn't seem to have any problems handling the output.

After I get reports from local stations the final testing I do will be to set up the antennas on the mast at a remote location and record the readings back at my home location so I can see for myself on the receive end.
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Last edited by cbradiomagazine.com; 04-18-2011 at 09:59 AM.

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Old 04-18-2011, 11:50 AM
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Very good report. I did a similar comparison, but mine was side by side. My results showed the GM ahead on signals just a little bit, less than .5 Sunit in this case however. I also saw the Imax produce TVI at my station while my GM showed none.

BTW, my A99 & I-10K averaged the same signals at my GM at 7.3 in this series. I think I posted the report in my album.

Looking forward to more reports.
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Old 04-18-2011, 03:52 PM
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good review. id would,ve like to seen the maco 5/8 u did a
review on go against it.nice job
BASE-magnum delta force, emperior 5010, AR 3500, sirio 2016
MOBILE-ss3900, uniden grant xl, z180, 636lS.E.

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Old 04-18-2011, 04:01 PM
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Thanks for your efforts... interesting and not surprising. Thanks.
Base: RCI 2995DX and RCI 2985DX w/ D-104 Silver Eagles on a Sirio Gainmaster (soon to be Mr. Coily Enforcer .64)
Mobile: General Lee w/SRA-198 mike on a Wilson Trucker 2000
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Old 04-18-2011, 04:43 PM
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I think it should not be surprising for a signal that is 3DB higher than another to be louder and clearer. That's how it is supposed to work.
Highlander, NA-821 on 11 Meters.
N9RZF, David on Ham Bands.

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Old 04-18-2011, 05:06 PM
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Originally Posted by cbradiomagazine.com View Post
Imax put a solid 6 on his meter, Gain Master a solid 6.5.
Originally Posted by Highlander_821 View Post
I think it should not be surprising for a signal that is 3DB higher than another to be louder and clearer.
From milliwatts to kilowatts its all cool to me .... but life is to short for QRP !!

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Old 04-18-2011, 05:20 PM
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Originally Posted by 359 View Post
Sure, each S-unit is supposed to be equivalent to 6db's.
With one-half an S-unit difference (the difference between 6 and 6 1/2 S-units), that would be 3db's.
When the human ear recognizes a 3db sound level change, it is perceived as twice as loud.
BASE: Kenwood TS-2000, GAP Titan DX, Diamond X50A, Sirio SY27-4, and IMAX 2000.
MOBILE: Galaxy DX99V w/RF Limited CR-577 mic, Sirio Z-180. Yaesu FT-8800R & Diamond NR-770.

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Old 04-18-2011, 05:20 PM
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Originally Posted by 359 View Post
if the s meter was theoretically perfect, then 6.5-6 does in fact equal 3.

first you need to remember the 6.5 and 6.0 are s units not db,(db's are only used on s meters above s9,ie s9+10db = s9 x 10,the signal is 10 times stronger than an s9 one), therefore 1 s unit is theoretically equal to 6db ( never happens on 90 odd percent of ham/cb radios,more like 1 or 2 db per s unit but thats another story altogether), therefore if 1 s unit = 6db then .5 s units = 3db as highlander correctly pointed out.

its about time the way s meters measure was clarified as far too many people talk in db's below s9 which just causes confusion and is completely wrong.

Last edited by jazzsinger; 04-18-2011 at 05:48 PM.

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