whips

[mc-20]

If you have a KX1 with the KTAT1-antenna tuner ,, does anyone know if and how good an antenna from Marine VHF transceiver would be, the kind that sits on top of a cabin roof,  -- or a CB truck antenna it would  be the kind in those trucks parts catalogs. Both of these types come with strong support brackets and use coax but both are grounded to the negative system battery. don't know the frequency that either VHF Marine or CB radios use.

Mike
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[crmabbott]

CB Channel 19 is 27.185 MHz and if the KTAT1 tuner has sufficient matching
capability you could probably easily hit 12 or 10 meters.  it might even
give 15 a shot.

The SGC tuner works quite well on 102" whip and the range is 80 up to 6
meters but it has an extremely wide matching range.  I am not familiar with
the characteristics of the KTAT1 but it won't hurt anything to try it.


----- Original Message -----
From: "mc" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, June 29, 2005 5:08 PM
Subject: [Elecraft] whips


If you have a KX1 with the KTAT1-antenna tuner ,, does anyone know if and
how good an antenna from Marine VHF transceiver would be, the kind that sits
on top of a cabin roof,  -- or a CB truck antenna it would  be the kind in
those trucks parts catalogs. Both of these types come with strong support
brackets and use coax but both are grounded to the negative system battery.
don't know the frequency that either VHF Marine or CB radios use.

Mike
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[Stuart Rohre]

Since the Marine band is 150 MHz VHF range, its matched antenna would not
make a good HF antenna.  However, with a tuner it might tune up on some ham
bands with some undefined pattern of takeoff depending on where the loading
coils for VHF are located on the Marine mast.

Stuart
K5KVH



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[n6wg]

Check the base impedance at hf.  Some antennas have a vhf matching circuit
in the base
that will look like nearly a short at hf.  If it doesn't show an open
circuit at hf,
it will probably be very difficult to match at hf.
Good luck and 73
Bob N6WG

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Stuart Rohre
Sent: Wednesday, June 29, 2005 4:05 PM
To: mc; [hidden email]
Subject: Re: [Elecraft] whips


Since the Marine band is 150 MHz VHF range, its matched antenna would not
make a good HF antenna.  However, with a tuner it might tune up on some ham
bands with some undefined pattern of takeoff depending on where the loading
coils for VHF are located on the Marine mast.

Stuart
K5KVH



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[G3VVT]

 
In a message dated 29/06/05 23:50:28 GMT Daylight Time, [hidden email]  
writes:

Check  the base impedance at hf.  Some antennas have a vhf matching  circuit
in the base
that will look like nearly a short at hf.  If  it doesn't show an open
circuit at hf,



Reply:---------------------------------------------
 
What Bob, N6WG mentions are the VHF antennas that are 1/2 wavelength  or
multiples of this and where the antenna feed end is at a high impedance. To  match
this a coil is inserted into the antenna base with the incoming 50 ohm  
feeder tapped in at an early point on the coil. Normally this type can  be located
even with a sealed marine type antenna by checking the  resistance across the
unplugged antenna lead should read S/C looking  towards the antenna. This type
of VHF antenna should not be capable if  working on HF. However if there is
no measurable S/C there is a good chance the  antenna is one that is a multiple
of a 1/4 wavelength and as such could be used  as a short whip antenna for
HF, though with rather limited efficiency.
 
Bob, G3VVT
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