Hi Mark 1 – No doubt the open loop. Although the large ferrite loop is similar in terms of nulling, but not gain. 2 – I prefer magnetic coupling, and even...
7419
airchecklover
Apr 17, 2010 3:17 am
Good find Paul. Heck, nothing is new!! But that's OK. I've been told there's a good paper on dual-phasing of loops at the ODXA website. Can't remember what the...
7420
airchecklover
Apr 17, 2010 2:49 pm
Neil; Sounds like you mean for MW. Well, to confuse things even more, let's add Choice #4) Open loop. What I know: I have a Chinese AOR clone. Gain and null...
7421
Darren Hennig
phones414
Apr 17, 2010 3:57 pm
For MW DXing only, the Quantum probably would be best, as it has the Q-tweaking feature to help tighten the tuning and add selectivity. I have the latter two...
7422
markthomasq
Apr 18, 2010 2:55 pm
Hi everyone Ive put up a vertical loop antenna 10 foot verticals and 12.5ft across ( basically a small flag antenna without the resistor.) fed by a 9:1 balun...
7423
w1aex
Apr 18, 2010 5:25 pm
Hi Mark, I have nothing definitive to tell you regarding the best balun value(s) for a receive loop antenna. I can only tell you that I use 9:1 baluns on my...
7424
marc
markov035
Apr 18, 2010 6:31 pm
Hello, I found this antenna tuner that seems to be for the 27Mhz band. Here some pictures http://users.fulladsl.be/spb13810/research/antennatuner/ If I adapt...
7425
ozzy_1kw
Apr 19, 2010 2:39 am
take the coil out and rewind one for 10 turns at 1.5" diameter. Tap the coil as needed.finished. Rob...
7426
pat walkup
p_walkup_2000
Apr 19, 2010 3:16 am
HI Marc in addittion to the tapped coil, you might also want to rewire one of the variable caps in series with the coil . That wou;ld mean insulating it from ...
7427
ZephyrNYC
zephyrhawaii
Apr 22, 2010 9:32 pm
Hello, everyone. Does anyone in the group feed an outdoor antenna with twin coax or regular (non-coax) balanced line going through a metal-framed window? If...
7428
M HOLDEN
mholden909...
Apr 22, 2010 10:20 pm
Take out one pane of glass, replace it with acetate sheet or plexiglass and run two terminal posts through two drilled holes. Connect the twin feeder either...
7429
Jim Dunstan
norlink88
Apr 23, 2010 1:27 am
... I have used balanced feed line 600 ohm home brew, 450 ohm, 300 ohm Twin lead, 75 ohm Twin lead (no longer available), and never had any problems with any...
7430
Jim Dunstan
norlink88
Apr 23, 2010 1:42 am
... Hi, Another technique I have used is to drill 2 holes through the frame a couple of inches from each other. Then push plastic tubing through the holes so...
7431
sasha_and_laurent
sasha_and_la...
Apr 24, 2010 3:09 am
Hello, I am new to the forum. It is looking very hitech to me!! I do not know much about antennas. I have a Sangean ATS909 and I want to bring it with me where...
7432
kevin asato
kc6pob
Apr 24, 2010 3:58 pm
Welcome. Let's start by finding out what frequency bands you are most interested in and if your antenna is portable or permanent. That would help in...
7433
osage_archer
Apr 24, 2010 4:34 pm
Although some may poo-poo them as not being a "real" antenna (whatever that is), you can find the "slinky" antennas on eBay which naturally are compact and...
7434
richard
g8jvm
Apr 25, 2010 9:42 am
Hi all How susceptible are mag loops to foliage on trees ? My 4mtr diameter loop I use for 80 mtr has now refused to resonate, sweeping it from a sig gen there...
7435
capntripps2000
Apr 25, 2010 7:20 pm
I never have a problem with my trees and resonance of my 80M magnetic loop. Only time I did was due to rain water on the UHF connector before I weatherproofed...
7436
richard
g8jvm
Apr 25, 2010 10:00 pm
On Sun, 25 Apr 2010 19:18:43 -0000 ... Thanks Andrew I'll do that. -- Best wishes Richard Bown ...
7437
sasha_and_laurent
sasha_and_la...
Apr 26, 2010 6:48 am
Thanks Tim for your input. As I mentioned I know nothing about antenna. My radio was provided with an external wire that is 7m long approx and that is rolled...
7438
grayrobertc
Apr 28, 2010 3:44 pm
Anybody have a car set-up? Maybe a rectangular look on top, outside or inside? I'd like to use my portable receiver in my car. I've tried wrapping a little...
7439
jose alonso
jaafes
Apr 28, 2010 4:17 pm
Try this : one short ferrite bar whith some wire coiled on it and connected to the antena input of the receiver. Then the ferrite is placed transversally to...
7440
jose alonso
jaafes
Apr 28, 2010 4:28 pm
Correction : the wire coiled in the bar must be conected to the antenna and ground of the receiver, with a short lenght of coaxial cable, or a pair of wires. ...
7441
grayrobertc
Apr 28, 2010 6:44 pm
Thanks Jose! I don't have a ferrit bar lying around. I've seen talk about the CCrane(?) ferrite bar. So let me ask...you get the bar, put it flush against the...
7442
Jim Dunstan
norlink88
Apr 28, 2010 11:44 pm
... Hi, An old ARRL antenna handbook (1950's vintage I believe) shows a loop arrangement for HF mobile. basically 2 grounded vertical antennas bent over and...
7443
Jim Dunstan
norlink88
Apr 28, 2010 11:51 pm
... PS... my last posting dealt with a HF transmitting antenna arrangement. the arrangement would work quite well for receiving ... as the loop would be tuned...
7444
dx11
ts6023
Apr 29, 2010 7:23 am
Hello, Google for "mobile loop antenna" and you will find these: http://www.smeter.net/antennas/mobile-loop-1.php ...
7445
sean
bitterlemon40
Apr 30, 2010 12:32 pm
I was thinking of making a loop antenna using copper foil. My understanding is that 100mm copper foil would be equivalent to 50mm copper pipe. However there...
7446
toddroberts2001@...
roberts50000
Apr 30, 2010 1:34 pm
In a message dated 4/30/2010 8:32:23 A.M. Eastern Daylight Time, bitterlemon40@... writes: I was thinking of making a loop antenna using copper foil. My...
7447
richard
g8jvm
Apr 30, 2010 1:55 pm
On Fri, 30 Apr 2010 09:33:54 EDT ... You can also use as length of heliax it nearly self supporting, LDF 4-50 is equivalent to 13 mm because of the ridges in...
