Bill
It is quite likely that the heating effect is different on each band and
some bands will prefer a longer feeder than others. The swr that the
matching unit provides is easy to measure but only tells us what the
transmitter sees. W8JI has a lot to say on the subject.
73
David
G3UNA
Mike,
I have been using the 130' Cobra Ultralite Senior Multiband doublet style
antenna by http://www.k1jek.com for several years. I currently use it
with my K2/100 and KAT100. The antenna comes with 100' of twinlead which I
attach to a DX Engineering 10KW 4:1 balun (DXE-BAL-200-H11_C) at my
Bill
DX Engineering stuff is very well made and I wonder if perhaps some of the
difference between theirs and the Elecraft BL2 is more a question of size.
I'm wondering if you could be getting the same amount of heat in each balun,
but the huge bulk of the metal-encased 10kW DXE product
David,
I am sure you are correct in your idea that just as much heat is produced in
the DXE balun as in the Elecraft balun but the heat is easily absorbed by
the huge DXE balun.
I do not have an analyzer to measure impedance at the base of the twin lead.
All I can say is that the KAT 100 is
]
To: elecraft@mailman.qth.net
Sent: Tuesday, March 11, 2008 6:54 PM
Subject: [Elecraft] K3 Multi-Band antenna thoughts
I am considering building a multi-band doublet fed with ladder line to
the
window and then 10-12 feet of coax to the K3 from the window
interface. I
would let the K3 ATU tune the beast
Robert Tellefsen wrote:
To make antenna matching easier for the TX, I have a
homebrew relay box that adds in various lengths of more
450 ohm window line to bring the feedpoint reactance
down to close to zero. This gives the ATU a chance to
match easily and gives the best 2:1 swr bandwidth.
:-)
73, Bob N6WG
- Original Message -
From: Vic K2VCO [EMAIL PROTECTED]
To: Robert Tellefsen [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]; elecraft@mailman.qth.net
Sent: Wednesday, March 12, 2008 9:59 AM
Subject: Re: [Elecraft] K3 Multi-Band antenna thoughts
Robert Tellefsen wrote:
To make
Robert Tellefsen wrote:
After listening to K9YC at our NCCC meetings, I
think I need to increase the impedance of this 1:1
choke balun though. It's a bit undersized from his
point of view :-)
Mine is huge, consisting of 13 turns of RG-58/u passing through SIX
FT-240-61 cores. A high
I am considering building a multi-band doublet fed with ladder line to the
window and then 10-12 feet of coax to the K3 from the window interface. I
would let the K3 ATU tune the beast. I have been playing with a coax
calculator and with low loss coax and 10:1 SWR the losses in the short run
of
] Behalf Of Mike Scott
Sent: Tuesday, March 11, 2008 7:55 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 Multi-Band antenna thoughts
I am considering building a multi-band doublet fed with ladder line to the
window and then 10-12 feet of coax to the K3 from the window interface. I
would
Mike, I'm having very good results with a 136.5 foot OCF dipole (1/3-2/3) fed
with 120 feet of 300 ohm ladder line to an Elecraft BL-2 balun and one foot
of coax to the K3. The SWR at the radio is less than 1.8 and as low as 1.2
across all of 80, 40, 20, 17, 12, 2/3 of 10 and even the first 1/4
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