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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 25th Jun 2020, 6:58 pm   #1
G6Tanuki
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Default ID this antenna-base?

[OK, I've replaced the Burndept socket with a SO239 because Burndept-plugs are as easily-available as fragments of Noah's Ark].

What's it from?

The insulator-part isn't flexible so I doubt it's from any sort of vehicle installation.

The screw-clamp and 4-way-split tube happily takes the stub of a Clansman HF whip, but the overall design-aesthetic (and the Burndept connector) says it's from the earlier Larkspur era.
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Old 25th Jun 2020, 10:11 pm   #2
Dave757
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Default Re: ID this antenna-base?

Hi,

I got mine with an 'Elevated Aerial 23 - 38 MHz', - see VMARS manual no 842.
I also got another aerial at the same time covering 30 odd MHz to around 60MHZ.
The manual is dated March 1961, so I guess should be Larkspur.

Kind regards
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Old 26th Jun 2020, 7:14 am   #3
Stockden
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Default Re: ID this antenna-base?

Umm, is it me or should there be a picture?

It certainly sounds like the base for a Larkspur elevated antenna intended for use with SR C42/C45 (depending on band). If so it would have been used with a 27’ mast and had a rigid telescopic rod as the vertical element, with fixed length wire radials as part of the guy ropes. The assembly formed a dipole and, because the radials were splayed, the lower element was relatively broad band. Frequency changing (at least once every 24hrs) meant dropping the mast, adjusting the length of the vertical element and putting the mast back up again, not always a popular activity at midnight on a cold, wet, windy night on the North German Plain!

Hugh

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Old 27th Jun 2020, 10:01 pm   #4
G6Tanuki
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Default Re: ID this antenna-base?

Sorry, something happened and the image got lost... here's a re-attahcment.

Everything suggests it's Larkspur-era. Intriguing that Clansman antenna-accessories mate well with it; I can see the obvious logic in this though.

I've also got a telescopic 3-section antenna assembly which may or may not have come with this base; its rods are calibrated in MHz and have little detent-notches that engage with the screw-collets of the respective sections.

Alas it's too short to work on 28MHz with my PRC320.
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Old 28th Jun 2020, 7:55 am   #5
Stockden
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Default Re: ID this antenna-base?

Yes, that is a larkspur elevated VHF base but missing the metal plate into which the guys/radials fitted and the spike that fitted into the top of the 27’ mast.

Hugh
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Last edited by Stockden; 28th Jun 2020 at 8:11 am.
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Old 28th Jun 2020, 8:31 am   #6
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Default Re: ID this antenna-base?

Sorry, I should have added that you may well have the vertical element for the C42 antenna (36-60 MHz). The C45 version (23-38 MHz as Dave said) would probably work with your PRC320 but you’d need to add or replicate the rest of the assembly for the lower half of the dipole.

Hugh
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Old 28th Jun 2020, 8:36 am   #7
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Default Re: ID this antenna-base?

And somebody's been at it. That looks suspiciously like an SO239 on the side not the usual Larkspur connector.
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Old 28th Jun 2020, 8:56 am   #8
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Default Re: ID this antenna-base?

Quote:
Originally Posted by ex seismic View Post
And somebody's been at it. That looks suspiciously like an SO239 on the side not the usual Larkspur connector.
Yes as explained in original post first paragraph

Cheers Mike T
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