Hello Larry et al,
It is certainly not the same company since W9KNI reduced his involvement. I
believe his son is at the helm. Just my opinion. 73, Bob K3UL
_
Topband Reflector
I've been waiting for an email response from Idiom press for 2 months.
Mike, KS0T
-Original Message-
From: Larry
Sent: Saturday, October 19, 2013 2:37 PM
To: topband@contesting.com
Subject: Topband: Idiom Press
Anyone know what is going on at Idiom Press? I placed 2 orders with them
Hi,
I am playing with a 3/8 radiator for 80m (to the time being fed against
40 radials of each 40m length).
What is the impedance I should expect from a 3/8 radiator?
My plan was to use it as a 3/8 on 80m and match it for you on 160m too
(until we will put a Gamma match on our 60m tower).
I had a similar experience a couple of years back. Customer support is not
what it use to be years back. Calls went unanswered, emails went
unanswered...I was about to trash the rotor controller and go to something else
when one day I decided to try calling once more and someone answered the
160 activity in Michigan is usually an hour or so before sunrise and after
sunset CW dxing from 1.810 to about 1.835. The are a couple of ssb ragchew
informal nets on 1.860 and 1.871 evenings after about 8pm. KC8QGJ is the
usual control on 1.871 very friendly ragchew bunch. Not much happening
Although still unable to participate due to my health reasons, yet, I
am happy to announce that YB9Y will be activated soon from Brass Isl.
in (Mapia Islands, Papua).
The new IOTA reference number for this station is OC-276.
Within few hours time, the team is about to depart from Jakarta and/or
Morning all,
I am planning to put in a DPDT switch (or relay) to allow me to easily
switch from using my 80m dipole as a vertical (T-top) antenna on 160m:
http://www.ae5x.com/docs/antennas/160mT.jpg
The dipole is fed with 450-ohm ladder line and used 10-80m in that
configuration so there
The simplest way is to get a DPDT knife switch. Look in the web and I am sure
you can find one.
73 de Price W0RI
I am planning to put in a DPDT switch (or relay) to allow me to easily
switch from using my 80m dipole as a vertical (T-top) antenna on 160m:
... ok, with the help of DJ2YA I made some math ... Seems the 3/8 lambda
will be around 200 Ohms ...
- for 80m I will put abt. 80pF in Series to the antenna and feed the
vertical through a 4:1 balun
- to match it for 160m I will put abt. 29uH in Series and abt. 4uH to
ground to get a match to
For years, I used Tyco DPDT relays. Open-wire feed, who knows what SWR,
full 1.5 kW.
For example:
http://www.mouser.com/ProductDetail/TE-Connectivity-PB/PRD-11DH0-110/?qs=sGAEpiMZZMtGt%252bn33CgIPz07uLBulijhRYGqdd4PmSw%3d
Mine were 12 VDC units, and with a little research you can probably find
Ditto on that series Tyco relays. I used them about 15 years ago when
switching line lengths on the W5DXP No Tuner All Band Antenna. That
antenna requires five relays to stretch open-feeder line lengths. They
performed well outside although they were protected from rain with simple
plastic
What is the real or best guess what value this inductor has? This is what I
am using.
Edge wound coil is 1/2 inch wide, 1/32 inch thick stock, coil is 2 1/2
inches long,15 turns, 4.5” ID, 5.5” OD
transmit tap is at 9 turns, 6 turns remain going to antenna. Inductance
calculations were found here
Hank's relay suggestion is a good one, because that relay has high voltage
breakdown from pole to anything else, including the frame. The weakest point
in that relay is contact to contact on the same pole, which is the least
harmful if it does arc.
You could have as high as 4000 ohms or
I know that T/R switches inside amps are fairly small in physical
size, however they are designed to operate into a fairly low SWR
load. I have no idea of what rating of a DPDT switch I would need
(per the diagram) in my application - perhaps I'm making a bigger
deal of something that isn't so
Interesting space condx that influence our propagation. Also interesting
archives.
http://www.spaceweather.com/
73
Bruce-K1FZ
www.qsl.net/k1fz/beveragenotes.html
_
Topband Reflector
Hey guys, thanks so much for the info.
I do have a ceramic-based knife switch that I bought years ago and had
forgotten about.just dug it out a few minutes ago so now I finally have a
use for it. The switch will be outdoors just downstream of the balun so if I
eventually tire of having to go
Jim, tnx for sharing your direct experience.
Best 73 de Rik, IK2CAW
2013/10/18 Jim Bennett w6...@mac.com
Rik -
Last year we replaced the 20+ year old roof on our house. It was made of
treated cedar shake boards, with simple tar paper and plywood underneath.
My antennas consist of (1) 26.8
Grant, tnx also to you.
I think you highlight the very critical point; electrical connectivity
along panels is likely to change along time and could randomly impact the
pattern/SWR of nearby antennas.
I think I will opt for a neutral (no aluminium) roof: I'll miss a good
ground for a roof mounted
Hi, Carsten
You might try it with just a series C into the 3/8 wave on 80m. The VSWR may
not be that bad! Then you could always add a 4:1 balun or transformer if
needed.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carsten
The rub with any of this is the contact-to-coil breakdown.
- Original Message -
From: Joe Subich, W4TV li...@subich.com
To: topband@contesting.com
Sent: Sunday, October 20, 2013 12:57 PM
Subject: Re: Topband: Antenna switch rating for high SWR?
I know that T/R switches inside
I liked the idea of the ceramic based knife switch! That ought to take most
anything us hams could throw at it at pretty much any VSWR! :-)
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Sunday, October 20, 2013 6:39
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