Check out
http://audiosystemsgroup.com/Coax-Stubs.pdf
100 ft of almost any decent RG8-size or RG11-size coax is just fine for a
Field Day antenna on the HF bands. On the lower HF bands, RG8X-size coax is
just fine.
73, Jim K9YC
Well heck if LMR400 is .7dB/100ft I'm not so sure that its worth mucking
with finding adapters for it as if I end up having to put 2 adapters on
each end to get it to something I can use there goes most of my
advantage of stepping up from LMR400 to LMR600...
The loss in connectors or
Yea I know I'm going way overkill and I was doing all the calculations
by hand of total loss and at a 7:1 SWR (which is entirely possible on
this 43 ft vertical) the loss at 30Mhz can get kinda ugly... I've not
modeled it fully but on all bands but on 20 meters its 7:1 and on 40
meters its 3:1...
I was starting to look at connectors when comparing getting adapters to
use the LMR600 that I have to that of using LMR400 that I have with the
right connectors on it already...
From what I've seen in other models I'm expecting 7:1 SWR on 20 and 3:1
SWR on 40 with the 4:1 UNUN that DX recommends
This reflector has more off-topic posts than any I've ever been involved
with. Perhaps the solution (other than the delete key) would be for
people not to reply.
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at
--
From: Phil Kane k2...@kanafi.org
Sent: Wednesday, June 23, 2010 12:10 AM
To: Brett Howard br...@livecomputers.com
Cc: elecraft elecraft@mailman.qth.net
Subject: Re: [Elecraft] Coax Loss Figures
On 6/22/2010 8:55 PM, Brett Howard wrote:
From my calculation a 5:1 mismatch
: [Elecraft] Coax Loss Figures
On 6/22/2010 8:55 PM, Brett Howard wrote:
From my calculation a 5:1 mismatch on 100 feet of L...
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On Wed, 23 Jun 2010 00:19:03 -0700, Brett Howard
br...@livecomputers.com wrote:
Ditch the 43 foot vertical! The 43 foot vertical craze is a joke, as
you can see by the figures, Tom, W8JI, gives you in his post showing
feedline loss and SWR.
During FD you are going to get most of your points
This is definately something I plan on trying but first I'm going to use it
as intended and record results to see how they match with what I'm told and
what I read... For me its not about the score its about new things to try
and more data to capture and understand. I think overcoming the
...Ditch the 43 foot vertical! The 43 foot vertical craze is a joke, as
you can see by the figures, Tom, W8JI, gives you in his post showing
feedline loss and SWR
With a 1:4 unun at the base of the antenna, the VSWR from 40-10 meters is
not bad - resulting in minimal coax losses. However,
Actually I did one better... I found a great power point presentation
and read that whole thing... Really dug being able to see the SWR
plot that you had in there and that gave me a lot more confidence that
I was going to be able to use my internal ATU in the K3 to get enough
swing to get the job
On Wed, 23 Jun 2010 11:43:30 -0500, Phil Debbie Salas
dpsa...@tx.rr.com wrote:
See below...
...Ditch the 43 foot vertical! The 43 foot vertical craze is a joke, as
you can see by the figures, Tom, W8JI, gives you in his post showing
feedline loss and SWR
With a 1:4 unun at the base of the
I'm trying to find the specs on this chunk of coax that has the RP-TNC
connectors on it... I'm not having a lot of luck but perhaps someone is
more familar with it than I... Its just says Amphenol TWO 6001 9G
Then the box just says its a Cisco Systems Ultra Low Loss Coax
Assembly... And being
want to move the match point
of a 43' vertical 100' into your shack you probably should be looking for some
7/8 Helix.
Wes N7WS
--- On Tue, 6/22/10, Brett Howard br...@livecomputers.com wrote:
From: Brett Howard br...@livecomputers.com
Subject: [Elecraft] Coax Loss Figures
To: elecraft elecraft
I think I found a sheet that says its LMR600 or at least its in a
grouping that makes me think it might be LMR600.
OD on the stuff is .591 by my measurements.
From my calculation a 5:1 mismatch on 100 feet of LMR-400 would still
get me 75watts out the antenna at 30Mhz and things only get better
On 6/22/2010 8:55 PM, Brett Howard wrote:
From my calculation a 5:1 mismatch on 100 feet of LMR-400 would
still get me 75watts out the antenna at 30Mhz and things only get
better as I head down into 20 and 40 meters.
On that basis, see if you can get some 75 ohm hardline from
your local
In Cisco parlance, Low Loss and Ultra Low Loss refers to classes
of Aironet coax cable assemblies. On this data sheet:
http://tinyurl.com/yr8fck
we find these described in Table 8. If you indeed have part nbr
AIR-CAB100ULL-R (where the ULL means Ultra Low Loss) then the
attenuation is specified
I know I'm about to sound completely nuts to everyone but I'm just doing
all this stuff for FD... ;)
I'll probably end up using the 100' or 50' chunk of LMR400 that I have
laying around here depending on how far away the antenna has to be from
the tent... Being that I'm going to be running 40
Thats another really great data point! Knowing Cisco getting the word
ultra printed on the box cost a good chunk of extra change! ;)
Well heck if LMR400 is .7dB/100ft I'm not so sure that its worth mucking
with finding adapters for it as if I end up having to put 2 adapters on
each end to get it
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