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10 m beam 3 to 4 elm
- Thread starter Al n3izr
- Start date
Siro on 10
The siro is a light weight 27 mhz beam on a short boom.( 3 meter for 3 el and 4 meter for 4 el)It is easy to assemble and tune and works ok.Mine worked straight out of the box on 27mhz. You could just retune the gamma match for 28 but the pattern is not the best.Better to cut the elements for 10 meters . I rescaled using Yagicad and left the el spacing as they were and tweaked it a little with the program ie i shortened the reflector slightly after scaling .You can just scale by multiplying the dimensions by .96 ,that will get you in the ball park. If your looking for max gain and bandwidth try something with a longer boom ie 4 meter for 3 and 5 to 6 meters for 4el. The elements on a siro push in to a bracket on the boom and are secured by grub screws , this creates a weak point and can be a problem if your location is prone to frequent high winds and or snow and ice. You can strengthen the joint with a dowel placed in the element end before assembly!. I also greased all the screws to stop them rusting and over wrapped them all with tape.In summary as long as your happy cutting elements ,they are not adjustable, the siro is a good(not great) CHEAP 10 meter beam.
The siro is a light weight 27 mhz beam on a short boom.( 3 meter for 3 el and 4 meter for 4 el)It is easy to assemble and tune and works ok.Mine worked straight out of the box on 27mhz. You could just retune the gamma match for 28 but the pattern is not the best.Better to cut the elements for 10 meters . I rescaled using Yagicad and left the el spacing as they were and tweaked it a little with the program ie i shortened the reflector slightly after scaling .You can just scale by multiplying the dimensions by .96 ,that will get you in the ball park. If your looking for max gain and bandwidth try something with a longer boom ie 4 meter for 3 and 5 to 6 meters for 4el. The elements on a siro push in to a bracket on the boom and are secured by grub screws , this creates a weak point and can be a problem if your location is prone to frequent high winds and or snow and ice. You can strengthen the joint with a dowel placed in the element end before assembly!. I also greased all the screws to stop them rusting and over wrapped them all with tape.In summary as long as your happy cutting elements ,they are not adjustable, the siro is a good(not great) CHEAP 10 meter beam.
I use a stock 4 element Sirio beam on 10m with great success; didn't change a thing. All I did is use an antenna tuner and that was enough. Used it up to 28.5mhz USB this way. Talked to Moscow three times and got a 10 over 9 report with less than 100w as well; Mongolia and Malaysia too. Smoked many who use a tribander, simply because it is a monoband beam - IMO. Of course, conditions were favorable.
You could re-tune it to the 10m band; but I have no idea why you would go to the trouble unless you don't have a tuner.
Changing it to a 4 element is a matter of just adding some homebrew parts to it and measuring the lengths.
You could re-tune it to the 10m band; but I have no idea why you would go to the trouble unless you don't have a tuner.
Changing it to a 4 element is a matter of just adding some homebrew parts to it and measuring the lengths.
If it is to be used on 10m only it should have the elements shortened at least.
Robb running an 11m antenna on 10m with a tuner and then claiming great signal reports so therefore there is nothing wrong with it and suggesting that he should not attempt to retune the antenna unless he doesn't have a tuner simply shows a lack of understanding and an acceptance of poor operating practices.
I have had 59+ reports from a dipole 15 feet off the ground running 25 watts pep. That does not mean I think that is all anyone should use. I have also had 59 reports from a 100 watt mobile with a Hamstick antenna working 15,000 miles via longpath but no way would I suggest that is all anyone needs for a mobile setup. There is no doubt a resonant antenna will outperform an antenna being operated off resonance thru a tuner so why not do it right and pick up a couple extra free dB of gain in the process? You will never find a cheaper way to add those dB.
ROBB not changing a thing will work. But not as good as it can be.
I have a Two element cubicle quad built on the test tower. spacing is 108" between the driven element and the reflector. 10 gauge stranded teflon coated wires for the elements, Design freq is 27.300 mhz. Gamma match for impedance matching,
The 2:1 VSWR bandwidth according to the mfj259B analyzer is 26.000 to 29.999 mhz. Almost 4 mhz. Quads do have a low Q,
Reactance of X=0 is almost the whole 40 channels of 11 meters.
The bottom of the elements are 4' off the ground.
I was checking the F/B turning it East to West looking at how much rejection it had. About 15DB as to be expected on a long boom two element.
So I decided to key into it and see what happened.
I made a contact on 38LSB last weekend to a mobile in San Diego.
It was not the antenna, it was propagation.
If the original poster wants a 4 element yagi for 10 meters then it needs to be designed for the center frequency of the portion of that band he wants to work. CW/ Phone/ AM/FM ???
Many online calculators for yagi design. Google is your friend.
I do not own a sirio antenna. Probably never will, I build my own.
If you are looking to purchase an yagi and be able to adjust it for 10 meters look at Macos. or Look at Mosley, cushcraft etc. Also QTH.COM usually has some mono banders on the classifieds boards for decent prices.
I have a Two element cubicle quad built on the test tower. spacing is 108" between the driven element and the reflector. 10 gauge stranded teflon coated wires for the elements, Design freq is 27.300 mhz. Gamma match for impedance matching,
The 2:1 VSWR bandwidth according to the mfj259B analyzer is 26.000 to 29.999 mhz. Almost 4 mhz. Quads do have a low Q,
Reactance of X=0 is almost the whole 40 channels of 11 meters.
The bottom of the elements are 4' off the ground.
I was checking the F/B turning it East to West looking at how much rejection it had. About 15DB as to be expected on a long boom two element.
So I decided to key into it and see what happened.
I made a contact on 38LSB last weekend to a mobile in San Diego.
It was not the antenna, it was propagation.
If the original poster wants a 4 element yagi for 10 meters then it needs to be designed for the center frequency of the portion of that band he wants to work. CW/ Phone/ AM/FM ???
Many online calculators for yagi design. Google is your friend.
I do not own a sirio antenna. Probably never will, I build my own.
If you are looking to purchase an yagi and be able to adjust it for 10 meters look at Macos. or Look at Mosley, cushcraft etc. Also QTH.COM usually has some mono banders on the classifieds boards for decent prices.
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It will work If you want to settle for second best. why bother?, simply put ,performance. I've done this real world as well as on the software and the optimized beam is much better.P.S optimized or not the siro 4 will outperform trapped tribanders
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Starting to split hairs here I think. The traps on a tribander are not even in the circuit on 10m and thus offer no losses due to loading or resistive losses. Also not all tribanders are created equal. My tribander has a separate monoband 10m reflector and a separate parasleeve shock excited 10m driver element. The only 10m element with any traps in it is the director and the losses from end loading are almost nonexistent. It`s a Hygain Explorer 14 BTW.
Oh, I agree that re-tuning the length and spacing is the optimal way to do it. No question about it.
All i pointed out is that a tuner makes it work just fine and the anecdotal evidence is there to back it up - is all.
Bad practice. Bad operator. I get it. Still beat the tribanders tho - lol . . .
All i pointed out is that a tuner makes it work just fine and the anecdotal evidence is there to back it up - is all.
Bad practice. Bad operator. I get it. Still beat the tribanders tho - lol . . .
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My 20m Hamstick mobile beat out all the other stations, tribanders or monobanders or LPDA`s when i returned the call to 3B9C when he was calling CQ via longpath. Hell it even beat out the guys running Henry`s and Alphas too. It did the same thing to ZS6CCY and 3DAØTM. :laugh:
http://www.qrz.com/logbook/?callsign=KI6USW&op=list
OK; this is my list on QRZ. 95% of all the 10m contacts are on the beam from here on the West Coast. The earliest entries were on the IMAX 2K. After that - all beam. Got South Africa too. Would have gotten E.Africa if there wasn't a motormouth out there that day.
10m is a blast when it is open!
OK; this is my list on QRZ. 95% of all the 10m contacts are on the beam from here on the West Coast. The earliest entries were on the IMAX 2K. After that - all beam. Got South Africa too. Would have gotten E.Africa if there wasn't a motormouth out there that day.
10m is a blast when it is open!
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Some days it's like pulling teeth! Somebody want to get back on track and comment on the Siros on 10m .
I have two of the Sirio antennas, the 5000 turbo for the mobile, and the m-400 starduster type antenna. If the beam is anything like those, the beam should be pretty good. Both of my Sirio antennas exhibit broad range of useable frequencies. At 28.300 MHz the swr is 1.4 and on CB channel #1 it is 1.2 on the M-400. I have not taken my radio to the mobile yet but I'm sure if any tuning is required it will be minimal. It's flat across all 40 CB channels. I know of a local CB'er that runs one of the beams and he tuned his to the high end of the cb channels and he has pretty good luck with his.
10 meter beab
Look at the Maco antennas easy assembly adjustable element length comes
with the lengths already calculated for 10 or 11 meters
instructions here
Maco Assembly Instructions
m-103 or m-104
72+1 RCB
Look at the Maco antennas easy assembly adjustable element length comes
with the lengths already calculated for 10 or 11 meters
instructions here
Maco Assembly Instructions
m-103 or m-104
72+1 RCB
Look at the Maco antennas easy assembly adjustable element length comes
with the lengths already calculated for 10 or 11 meters
instructions here
Maco Assembly Instructions
m-103 or m-104
72+1 RCB
I would second this quote.
I have a Sirio Sy27-3. Although I built it per the instruction manual to use on the 11 meter band it will still work on the 10 meter band.
Here is the Swr per frequency I get.
28.200 1.7
28.300 1.8
28.400 2.0
28.500 2.2
I also use my antenna tuner and have had great success using my Sirio 3 ele on 10 meters. It is a compromise in my opinion, but still works great.
If your wanting to strictly go with 10 meters then I would go with the Maco and build the antenna per the specs in the manual for the portion of the 10 meter band you are wanting to use the most.
how about a group design effort?
Al, just list the inter-element spacings for the ant you are considering,
and the part of 10m you intend to use.
I have a yagi design program called ym311, I am sure there
are many others.
perhaps I or someone else will make
suggestions for element lengths and gain.
sure beats a stab in the dark.
(73)
Al, just list the inter-element spacings for the ant you are considering,
and the part of 10m you intend to use.
I have a yagi design program called ym311, I am sure there
are many others.
perhaps I or someone else will make
suggestions for element lengths and gain.
sure beats a stab in the dark.
(73)