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 Returning to the fold - antenna question

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pdes
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PostSubject: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeSun Dec 13, 2020 11:20 am

After some 20 years, I have decided to dig out my old gear and cobble it together. However, I am confused about whip length.

I have a Sirio Hi-Power 3000 but in my box, I have a couple of whips of differing lengths. The spec for the aerial is 1740cm. Is this the length of the whip or the total length from the base of the coil to the tip of the whip?

Once I get this sorted, I am sure I'll be back for more refreshers!

Thanks

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Alan Pilot
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PostSubject: Re: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeSun Dec 13, 2020 11:54 am

If you have an SWR meter then just try them both but turn the power down.
I have the 4000 but not by me but it is quite long the whip on it.
At a guess it's around 140/150 but i would try them to see what the swr will come down to.
Not a lot of help but the best i can do sorry.

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PostSubject: Re: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeSun Dec 13, 2020 12:44 pm

Thanks both,

I have been trying the short one but the SWR meter shows a full swing on 3, i.e. no difference between FWD and REF.  Unfortunately, I am trying to set this up on an old Land Rover which is primarily aluminium (with a large steel chassis) so there is a chance that the ground plane isn't optimal.  I have done all the usual checks to make sure the earth, and cable characteristics are satisfactory but I don't want to start cutting the long whip (which is a new 2 meter whip) without being sure that I am close enough to the necessary length to be able to make the final, small adjustments.  I suppose, if I go by the manufacturers length and assume its from the coil base, at least this will be a reasonable starting point.

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PostSubject: Re: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeFri Dec 18, 2020 6:24 pm

The difference in the overall lengths of 3000 and 4000 antenna is the difference in the length of the stainless steel whip as the mouldings used for the matching coil cover in the base are the same ones.

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Alan Pilot
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PostSubject: Re: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeSat Dec 19, 2020 7:20 am

Did you check the coax connection in the base they can be a bit dodgy Sirio can.

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PostSubject: Re: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeSat Dec 19, 2020 9:41 pm

All, after many hours of testing, running cables, resoldering plugs and spending money on new cable and whip, I decided, as a last resort, to buy a new SWR meter. You guessed it, my SWR meter was faulty! All of my kit was fine. All tuned in 5 minutes and the old meter consigned to the bin.

Thanks again.

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Alan Pilot
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PostSubject: Re: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeSun Dec 20, 2020 7:38 am

Glad you got it sorted out.

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PostSubject: Re: Returning to the fold - antenna question   antenna - Returning to the fold - antenna question Icon_minitimeSun Dec 20, 2020 1:54 pm

Isn't that always the way?

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