Then you'd be using the T1 to partially drop the SWR on the coax, but it
still wouldn't be anything close to 1:1 unless the T1 has a much broader
range than the tuner in the KX2. You'd still have some additional coax
loss due to SWR (but less loss, of course) and you'd still need the
tuner
The SWR could easily exceed 15:1, depending on the operating frequency (short
loaded whips can be very narrow banded) and other factors that apply to
portable operation such as radial configuration, ground characteristics, and
antenna height.
Even 2 dB matters when you're using QRP.
Wayne
Scroll down to the original post. We were talking about a KX2 with an
internal antenna tuner. Presumably the tuner works as it should to
present the proper load to the finals.
73,
Dave AB7E
On 8/7/2019 5:29 PM, Mark Goldberg wrote:
You need to take into account the radio finals. When
Some points…
“…dragging along a remote tuner”
Surely you are kidding or you get the award for hyperbole of the day. The T1
fits in my shirt pocket! It is zero effort to bring — no “dragging” required.
And, I operate with 50 feet of coax because carrying multiple different lengths
of coax on
Doesn't much matter. You're still talking a 3 dB difference at most (50
feet vs 30 feet), and while I will be the first to argue the benefit of
every single dB for normal station operation (see
http://www.ab7e.com/weak_signal/mdd.html), I don't understand the angxt
over that 3 dB for
Yeah, i didn't catch that he was going to use the internal tuner and just
forgo the external one at the other end of the coax.
In that case, I agree with Dave.
73,
Mark
W7MLG
On Wed, Aug 7, 2019 at 6:19 PM Wes wrote:
> I haven't been following this thread closely but I think Dave makes good
I haven't been following this thread closely but I think Dave makes good
points. As to the final fold-back, if I waded through this correctly, I
understand that the OP has the built-in tuner in his KX2. That solves that issue.
BTW, SWR = 15:1 is a return loss of about 1.1 dB, not 3 dB.
Wes
You need to take into account the radio finals. When the SWR is high, My
KX3 cuts back because it gets too much reflected power. I expect the KX3,
and in fact any other radio or amplifier is similar. 15:1 is about half the
power coming back.
Regards,
Mark
W7MLG
On Wed, Aug 7, 2019 at 5:14 PM
Rather little of this discussion makes sense to me.
Let's look at this realistically:
1. The antenna tuner in the KX2 is rated to be good up to 10:1 SWR.
Let's assume it's good to 15:1.
2. Let's assume you're using a decent cable for portable operation like
RG-8X.
3. Let's assume
Sounds like an idea worth trying — I have always wondered about the coax loss
between my KX3/KX2 and my portable antenna no matter which one it is (i.e.
AX-1, Wire and counterpoise wires, Buddipole, etc.).
But, really glad I did not sell the T1 on several occasions of thinking about
selling
I think a T1 at the base would make a noticeable difference if the coax were
more than a few feet long and the whip's resonance well removed from the target
operating frequency. Short whips can be extremely narrow-banded.
Wayne
> On Aug 7, 2019, at 7:40 AM, Don Wilhelm wrote:
>
> Bret,
>
Bret,
Yes, the T1 mounted at the antenna will reduce the potential loss in the
coax.
Will you notice the difference? Maybe or maybe not.
73,
Don W3FPR
On 8/7/2019 7:54 AM, MaverickNH wrote:
It comes to mind I have an Elecraft T1 ATU I might try attaching directly to
the base of the AX1
It comes to mind I have an Elecraft T1 ATU I might try attaching directly to
the base of the AX1 rather than relying on the KX2 ATU 25-40ft from the
antenna. I try to operate closer but sometimes have to run that RG58 to
clear obstructions. Thoughts?
Bret/N4SRN
--
Sent from:
Me, Too!
73,
Bill
K9YEQ
https://wrj-tech.com/
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of J Chester
Sent: Tuesday, August 6, 2019 1:39 AM
To: David Thompson
Cc: elecraft@mailman.qth.net; MaverickNH
Subject: Re: [Elecraft] AX1 Loaded Whip Antenna
Yes, David,
Probably early September
Joe
> On 6 Aug 2019, at 00:03, David Thompson wrote:
>
> Joe…
>
> Will you have reprints available? I would like to see a copy of the article.
>
> Thanks!
>
> David Thompson, AG7TX
> Jack of All Trades
> Master of None
> dbthomp...@me.com
>
>
>
>
>>
Joe…
Will you have reprints available? I would like to see a copy of the article.
Thanks!
David Thompson, AG7TX
Jack of All Trades
Master of None
dbthomp...@me.com
> On Aug 5, 2019, at 02:21, J Chester wrote:
>
> Bret,
>
> I’ve just submitted a review of the AX1 to Practical Wireless
Thank you Joe! I shall look forward to reading your article soon.
Bret/N4SRN
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Help:
Bret,
I’ve just submitted a review of the AX1 to Practical Wireless magazine, which
should appear be in the October issue, published end of September.
I found it worked well on the tripod. The key to getting the most out of it is
to let the counterpoise wire fall to the ground about 3 ft or so
I've got my little 20m AX1 and 3 tuned counterpoise wires on a 4ft tripod
with wires extending to plastic chairs 3ft off the ground too. If I got that
whip up to 2m above ground with sloping wires, would I gain much?
Bret/N4SRN
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