New Sirio Tornado 27

[Marconi]

Ok I went ahead and put it at 34" just to see what happens.

Ch 1 1.4 and Ch 40 1.2 Radio
Ch 1 1.2 and Ch 40 1.9 Workman HP201S


So what do you think?

I think something is wrong with your in line meter. IMO it is not the antenna since you report a similar issue with another antenna...and that is not likely.

Just to be sure, are you re-calibrating your HP201S meter on each reading?

My Eznec model suggest this antenna produces a narrow bandwidth, but I don't believe that is the problem noted here either.

959, if you have to take your antenna down in order to adjust your tip length again, could you measure the length from the very bottom at the base of the mount up to the top of the 5 element telescopic whip below section "L"?

Tell me how long is the mounting area below the radials too.

Thanks,

 

[Galaxy 959]

I think something is wrong with your in line meter. IMO it is not the antenna since you report a similar issue with another antenna...and that is not likely.

Just to be sure, are you re-calibrating your HP201S meter on each reading?

My Eznec model suggest this antenna produces a narrow bandwidth, but I don't believe that is the problem noted here either.

959, if you have to take your antenna down in order to adjust your tip length again, could you measure the length from the very bottom at the base of the mount up to the top of the 5 element telescopic whip below section "L"?

Tell me how long is the mounting area below the radials too.

Thanks,

Yes I will measure it for you if I take it down again. I'm done for now with it set at 35". You can see may last post before yours to see the results. I was re-calibrating for each reading yes.

 

[222DBFL]

I have to tend to agree with Marconi here. My tornado was set it and put it up pretty much. Not much playing with it as all that was needed was the top whip adjusted. But every install is different and that is what makes every one a bit different to trouble shoot. Having a good baseline reference to go by is a good thing. If you have a 50ohm dummy load, place it at the end of your coax run where the antenna would connect and see what readings you get. Should be flat on the VSWR. Or 1.0:1. This may help determine if it's truly the antenna and not your meter being the issue. JMHO.

 

[Galaxy 959]

Here is what my MFJ259 says. I know the ohms isn't right and wont be unless I have a 1/2 wave cut coax. On the SWR if I go up or down from the 11 meter band the SWR just increases. Its 1.4 or less across the whole 11 meter band.

 

[Marconi]

Here is what my MFJ259 says. I know the ohms isn't right and wont be unless I have a 1/2 wave cut coax. On the SWR if I go up or down from the 11 meter band the SWR just increases. Its 1.4 or less across the whole 11 meter band.

959, is the tip section still set at 35" inches?

 

[Galaxy 959]

959, is the tip section still set at 35" inches?

Yes.

 

[Marconi]

Yes.

Maybe your antenna is too close to the house, being so low if it is mounted like the image you posted in the beginning of the thread. Is you siding metal?

 

[Galaxy 959]

Maybe your antenna is too close to the house, being so low if it is mounted like the image you posted in the beginning of the thread. Is you siding metal?

Vinyl siding. Metal roof. Maybe my coax ends are not done properly. I stripped and folded ground back and screwed 259 down on the ground and cover. Just soldered center pin.

 

[Marconi]

Vinyl siding. Metal roof. Maybe my coax ends are not done properly. I stripped and folded ground back and screwed 259 down on the ground and cover. Just soldered center pin.

The metal roof could be the issue and if the house uses metal studs that could also be a problem being so close. The other antenna looks further away...how does it seem to match?

I've used the same idea for installing connectors for years and never had a problem except maybe wear due to wind. I have my connectors installed using a crimping device and I've never had problem there either. Soldering may be best, but it also is problematic concerning the dielectric problems with heat. The center pin needs soldering.

 

[Galaxy 959]

No metal studs. Other antenna??

 

[Marconi]

No metal studs. Other antenna??

Looks like an A99/Imax out back.
http://www.worldwidedx.com/attachments/539209_717547048344745_8342163917715711368_n-jpg.17099/

 

[Galaxy 959]

Looks like an A99/Imax out back.
http://www.worldwidedx.com/attachments/539209_717547048344745_8342163917715711368_n-jpg.17099/

Yea that's my Antron 99. It was 1.2 also across the band. That is where the sirio is now. That pic was when I was just testing the sirio.

 

[Marconi]

959, I know a lot of post have been made in your thread so far. I believe you are good to go...working your new antenna and your match is about as good as I see here with my Eznec model. That is never a true comparison, but that is all I can do in this case. I think a few others have reported similar matching results with their T27, so you should feel it OK to work the antenna and it working about as good as possible.

Do you think you understand why maybe both your antennas required unusual settings in order to get a good match at your location?

How is you antenna working, and how does it compare to your A99 in performance and noise?

Good luck, and keep us posted.

 

[Galaxy 959]

959, I know a lot of post have been made in your thread so far. I believe you are good to go...working your new antenna and your match is about as good as I see here with my Eznec model. That is never a true comparison, but that is all I can do in this case. I think a few others have reported similar matching results with their T27, so you should feel it OK to work the antenna and it working about as good as possible.

Do you think you understand why maybe both your antennas required unusual settings in order to get a good match at your location?

How is you antenna working, and how does it compare to your A99 in performance and noise?

Good luck, and keep us posted.

I'm really not sure why about the unusual settings unless it needs to be above the trees. The one is real close. Limbs almost touch the radial. But my antron had no ground plain.
The tornado works awesome. Better than my antron and hardly any noise.

 

[222DBFL]

959, you might try an added coax jumper and see if the VSWR changes. This might work to help with the VSWR issues you think you have. If you feel as if you are good then leave it be, if you feel like experimenting, try adding a 3,6 and even a 9ft jumper to see what difference it makes in your VSWR readings. You might be suprised at what you see.