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Starface
Senior Member
Username: Starface
Post Number: 1372
Registered: 1-2005
| | Posted on Friday, July 13, 2007 - 2:14 am: | 
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I have been asked by a few Copper CEF Members to do a review on this Antenna so here it goes.
Over all putting it together takes under 30 minutes.
There is no guessing at spacing the elements as the boom has per-set hubs.
Only thing to set is the gamma match and thats even easy. (either set it for 10 or 11 meter or both) I have it set to go from 26-28 MHz.
I have it on my Rohn 25g tower on the flat side at 36 foot to the feed point.
I've been useing it for about a year now on 11m and have got a lot of CEF members during the nets.
Now that I got a Magnum 257 I've hook it up to the Sirio SY27-4 4 Element Beam and been doing great with it on 10m this pass week.
I have even worked CEF559 and CEF376 both in Long Island New York the second day I had the Magnum hooked up to the Sirio SY27-4 4 Element Beam.
I'm very please with it and the great reports I get with it both on 10 and 11 meters.
If your looking for a great small beam antenna I would go with the Sirio SY27-4 4 Element Beam.
If there is anything I left out that you would like to know about this beam for what I now know about it posted away and I'll try to answer it the best I can.
NOTE:Remember I'm no Antenna Expert and all answers will be from my personal use.
73 de George
STARFACE
CEF#476
KI4NBE
HAM#181
CVC#Ø14
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Tech808
Moderator
Username: Tech808
Post Number: 14053
Registered: 8-2002
| | Posted on Friday, July 13, 2007 - 6:42 am: |
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Sirio SY27-4 4 Element Beam
CLICK HERE > Sirio SY27-4 4 Element Beam
Information below is from the Copper Item Description.
Specifications
Frequency range: 26-28 MHz
Impedance: 50ohm unbalanced
Radiation (H-plane): directional
Polarization: horizontal
Gain: SY 27-4: 11 dBd, 13.15 dBi
Bandwidth at V.S.W.R. 2:1: 600 KHz
Max. power: 1000 Watts
V.S.W.R. at res. freq.: ~1.2:1
Feed system / position: Gamma match / center
Connection: UHF-female
Lon ~ Tech808 ~ N9CEF
CEF#808 ~ CEF HAM#33 ~ CVC#002
Tech808@copperelectronics.com
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Marconi
Advanced Member
Username: Marconi
Post Number: 740
Registered: 11-2001
| | Posted on Saturday, July 14, 2007 - 11:22 am: |
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Starface says: "Only thing to set is the gamma match and thats even easy. (either set it for 10 or 11 meter or both) I have it set to go from 26-28 MHz."
When setup as you note what kind of SWR do you see as you move across this very large range, or do you use a tuner?
With it set this way what is your reaonant center frequency?
Are the elements also fix for length like the spacing is?
I have seen bandwidth numbers represented on other sites for this antenna that vary from 600 kHz to 1500 kHz. What kind of bandwidth are you seeing below 2:1 SWR during actual operations? |
Starface
Senior Member
Username: Starface
Post Number: 1385
Registered: 1-2005
| | Posted on Tuesday, July 17, 2007 - 9:55 pm: |
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Marconi:
When setup as you note what kind of SWR do you see as you move across this very large range, or do you use a tuner?
25.165-25.605 1.5-1.9
25.615-26.055 1.9-1.6
26.065-26.505 1.6-1.9
26.515-26.955 1.9-1.3
26.965-27.405 1.2-1.1
27.415-27.885 1.1-1.4
27.865-28.305 1.3-1.1
38.315-28.755 1.1-1.9
28.765-29.205 1.9-1.7
29.215-29.695 1.7-1.9
Freqency in bold is the best range for lowest SWR and this test was done WITHOUT a tuner.
With it set this way what is your reaonant center frequency? 27.695
Are the elements also fix for length like the spacing is? YES with pre-set holds for set screws(line the holds up and set the screws.
Again I'm no Antenna expert and I just went by the paper work and those are the readings I'm getting WITHOUT a tuner.
STARFACE
CEF#476
KI4NBE
HAM#181
CVC#Ø14
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Marconi
Advanced Member
Username: Marconi
Post Number: 741
Registered: 11-2001
| | Posted on Wednesday, July 18, 2007 - 2:39 pm: |
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That is amazing. In the Specifications the bandwidth for this antenna is shown as 600 KHz below 2:1 SWR. That is probably reasonable for maximum gain with this antenna.
Starface, if you will plot the SWR curve on a graph you will see that your values do not present a typical bandwidth curve. Your values are all over the board, both above and below the narrow range in the CB band.
Could it be that you misread how this antenna will tune up for the three band range claimed? It may well have adaquate material to cover 12 meters as well, and the gamma may tune at resonance in 10, 11, or 12 meters, but I don't believe you can safely cover this entire range in frequency just by fixing the gamma at some particular spot on the element unless you are using a tuner, say nothing about the resonant element lengths required. |
Starface
Senior Member
Username: Starface
Post Number: 1386
Registered: 1-2005
| | Posted on Wednesday, July 18, 2007 - 7:44 pm: |
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I really don't know, just that those are the swr readings I get..I can't answer anymore at this point for not knowing the answer to give, sorry I wasn't more helpful.
STARFACE
CEF#476
KI4NBE
HAM#181
CVC#Ø14
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Radioreddz
Member
Username: Radioreddz
Post Number: 55
Registered: 9-2006
| | Posted on Wednesday, July 18, 2007 - 11:19 pm: |
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so i imangine this 4 element beam will preform the same as a maco 4 element but easier to assemble. also i wounder what can be done for it to handle more wattage can a 5000 watt gamma match from maco or joegunn be made to work with out changing the dynamics of the antenna? where i am i don't really need a extra heavy duty constructed antenna but need ease of assembly and installation i have to do it all myself. |
Marconi
Advanced Member
Username: Marconi
Post Number: 742
Registered: 11-2001
| | Posted on Thursday, July 19, 2007 - 7:44 am: |
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That's OK Starface, I didn't mean to suggest that I didn’t believe you. You reported what you saw. This is a breakthru in antenna design.
Starface I think it is great that you are able to report to us about a new line of broadbanded multi-element yagi beams that Coopers sells. With the advent of multi band radios available to CB operators everywhere this antenna will be a boon to all of those operators. |
Hotwire
Senior Member
Username: Hotwire
Post Number: 2331
Registered: 1-2005
| | Posted on Thursday, July 19, 2007 - 10:57 am: |
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I have contacted George several times with his Sirio 4 element beam and the performance is outstanding. At distance of almost 1000 miles away! Many times when propagation seems to be dead I hear ol' George tearing up the band and I try to get back but can't!
Keep up the good work George!
KEEP IT REAL!
Kenny
cef491(27.115lsb)
2sf491(27.555usb)
Indiana
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Unit199
Advanced Member
Username: Unit199
Post Number: 500
Registered: 8-2003
| | Posted on Thursday, July 19, 2007 - 1:14 pm: |
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I think some people get too carried away with all this technical jargon on antennas. If it works good through-out the bands, what difference does the technical jargon mean?????? Either it works or does not work!!!!
HARVE
UNIT199
CEF210
CVC18
KB0YVK
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Starface
Senior Member
Username: Starface
Post Number: 1389
Registered: 1-2005
| | Posted on Thursday, July 19, 2007 - 1:44 pm: |
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Radioreddz:
I have never used any of the Maco Antenna lines, But I have seen how both the Maco M104C Beam and the Sirio SY27-4 4 Element Beam are put together and I must say the Sirio SY27-4 4 Element Beam is a lot easier.
Marconi :
I'm still in the learning of antennas.
Unit199:
Yes I'm with you on the technical jargon,
Either it works or does not work.
Thanks for all the replys
STARFACE
CEF#476
KI4NBE
HAM#181
CVC#Ø14
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Patzerozero
Senior Member
Username: Patzerozero
Post Number: 3860
Registered: 7-2004
| | Posted on Friday, July 20, 2007 - 6:56 pm: |
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sorry, guys, i haven't read ALL of the posting to this, but, i would like to reply to marconi-EXACTLY the reason i asked on another thread a few weeks back about results with the sirio or maco m103. my maco v5/8 SHOWS SWR 2:1 bandwidth from 26.0-29.0, roughly. and, it does do just as starface's sirio beam shows, a graph that looks more like a 'roller coaster ride' then just 'into & out of a valley'. i don't remember #'s off hand, but use of an mfj259 shows a resonant freq on my v5/8 a bit different then where i originally tuned it-with an swr meter only-AND, even though R & X were 50 & 1 if i remember correctly, swr WAS 1.1:1 and LOWER slightly away from resonance. that is mounted not neccessarily in an optimum location and through 65' of 9913 coax. so, take all THAT for what it's worth!
now, for radio-survival purposes, if the swr SHOWS low enough, the magnums with antenna-warning-indicators 'don't' indicate any problems, & my HF rigs DO show full output, with a bit more reflect then 1.2:1 would normally be expected to show-say on the level of nearer 2:1. if i put my HF rigs to antenna with high SHOWING swr, normally, output power is cut from the get-go, and not usually shown as full output with higher reflect.
that scenario should make sense, the reasons FOR IT may be tougher to explain! |
Starface
Senior Member
Username: Starface
Post Number: 1402
Registered: 1-2005
| | Posted on Saturday, July 21, 2007 - 10:43 pm: |
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I really didn't know how to explain it but thanks Pat the Roller Coaster Ride is the look I'm getting.
STARFACE
CEF#476
KI4NBE
HAM#181
CVC#Ø14
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