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76
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eHam Forums / Antennas and Towers and more / Delta Loop Plans
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on: December 10, 2004, 07:08:16 AM
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Yes you can use two MFJ extendable 33 foot Fiber
glass poles to support it! Make a wooden plate with
U-bolts or Hose clamps to hold them at the proper
angle and piece of aluminum or wooden post to put
in the ground!
Use Duct tape a the the mast joints to keep them from
collapsing! Guy it with Polly twine (The stuff they give you at Home Depot
to tie stuff to your car roof.)
It is a excellent temporary antenna support rope.
A delta loop antenna is a full wavelength in lenght.
F/1005 will get you close.If you have a small external auto tuner you can
use it on 20 thru 10 and maybe even six meters! 20 meters is about
66 feet of wire or 22 feet on a side.you can lenghten the sides
and that will narrow the top wire span.
But most of the radiation is at the top wire!
With a auto tuner you can use twinlead to feed it
or just coax if you want 20 meters only.
You can make a wire gamma match to 50 ohms
that is what I do on mine).
My home brew 2 element ten meter delta loop beam with the top at 37 feet at 37 feet has worked 167
countries with 139 confirmed!
73 mike
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77
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eHam Forums / DXing / qsls
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on: November 16, 2004, 04:58:49 AM
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Get Libya stamps from WILLIAM PLUM
( plumdx@msn ).comand put them on a return envelope(He sells those also)and your return
postage problems are over! No one steals stamps!
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79
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eHam Forums / Elmers / Now I understand why so many don't like hamfests
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on: October 04, 2004, 05:19:09 AM
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I love Hamfest's!
I will go to as many as I can !
It is the best place to buy parts for my projects
at bargain prices (Also it's the only place I can buy parts and supplies that I might need! ).
My problem is that I work on every other weekend and
the mystic powers that schedule Hamfests, Miraculously
decide to do them on the weekends I have to work!
I think it's a mistake for ham clubs to schedule two
hamfest's in the same weekend if they are in the same local area. There are two Hamfests
this weekend.Both are local and I would like to attend both, But I am working on one of the days.
Both Hamfests are good ones BARA in NJ and Hall of Science in Queens, And I need parts for a couple of
antenna projects I would like to complete in the next two weeks before it gets too cold! And now I have to
choose whice one I can try to attend. If they were on alternate weekends I may be able to attend both!
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80
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eHam Forums / Amplifiers / Amplifiers & Antenna switches
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on: September 22, 2004, 09:12:08 PM
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I forgot to add info to the previous post.
Use a transfer type coax relay or manual switch!
This is special type that has four connectors on the back. when one amp is switched to the antenna the
other can be terminated into a dummy load.When you switch to the other amp the idle amp will be switched
to the dummy load.See the Dow-Key website for examples.
These commercial switches have very high isolation 60-80db between sections
You may find surplus units on the web at Ebay,Surplus Sales of Nebraska, or Max-Gain systems or order from Dow-Key?
They are expensive costing $150 or more for a new one from Dow-Key.
You can make one with one or two high quality RF type relays like the ones in
remote antenna switch boxes or good open frame relays with 20 amp contacts or even one 20 amp DPDT relay!
Hook up the swinging contacts one to each amp and the
stationary contacts will have to be wired crossover fashion with one to the Dummy load and the other to the antenna!
Check out the diagrams in the Dow Key website!
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81
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eHam Forums / Amplifiers / Amplifiers & Antenna switches
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on: September 22, 2004, 08:57:16 PM
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Use a transfer type coax relay or manual switch!
This is special type that has four connectors on the back. when one amp is switched to the antenna the
other can be terminated into a dummy load.When you switch to the other amp the idle amp will be switched
to the dummy load.See the Dow-Key website for examples.
You may find surplus units on the web at Ebay,Surplus Sales of Nebraska, or Max-Gain systems or order from Dow-Key?
They are expensive costing $150 or more for a new one from Dow-Key.
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82
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eHam Forums / Elmers / Enyone ever QSL to Cuba??
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on: July 21, 2004, 12:07:13 PM
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I use Foreign stamps . i get them from William Plum!
He has air mail envelopes in two sizes ,One fits inside the other for the return.I simply address the return envelope to myself and put a cuban stamp on it and you are all set.I write my call on the back of the envelope where the flap will cover it when sealed so the DX station doesn't forget which call gets which envelope. You can also send to cuba Via the bureau..
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83
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eHam Forums / Antennas and Towers and more / Channel Master 30ft telescoping mast
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on: July 16, 2004, 02:23:27 PM
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I have a 40 footer up at 27 ft or so supporting
two inverted Vee's and it is clamped to the 6ft chain
link fence behind the house and no guys and it's doing just fine!It has been up for there years now..
It is a strong mast ! I have the two dipoles with some tenion on them and its doing well!
73 mike
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85
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eHam Forums / Satellites / Boom Mast
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on: May 28, 2004, 08:14:47 AM
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check out the glen martin site! I saw fiberglass mast material on thier site yesterday.Also look up "EXTREN"
it is a special pultruded fiberglas structural products.Check out "AIN plastics" as a source!
This stuff is very rigid and not that expensive.
It is available in structural shapes and Tubes and Rods
up to four inches in diameter..and lenghts of ten and twenty feet long!
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86
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eHam Forums / Station Building / Coaxial Cable
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on: May 18, 2004, 08:21:53 AM
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It depends on how your tower/antenna placement looks
when plotted on graph paper! If you are running to four different corners of your property with the shack in the middle then you have to use more coax!
You can buy surplus/used runs of hard line for about two dollars a foot..see the ham classified ads in QTH.com.
Davis FR buryflex is excellent coax and its all I use at the present time.It is my choice for HF at up to 100 feet or so for ten meters but for 160 thru twenty meters you can go much futher with no problems.
You can run hard line to your VHF/UHF anteena tower and have a high quality remote rf switch (Transco,Sage,RLC and others)there to feed the HF antennas.
73 Mike
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88
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eHam Forums / Elmers / FT - 767
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on: January 06, 2004, 12:56:51 AM
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Unlike newer rigs the ability to reduce power is limited! In CW you can adjust the drive control.
In SSB you can use the Mike gain ..
73 Mike wb2lcw
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89
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eHam Forums / Elmers / Screwdriver antenna used as a vertical?
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on: January 02, 2004, 01:52:28 PM
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Here is my latest update!
I trimmed the eight radials to ten fett long.
I was getting a 1.5: swr with my MFJ analzer
on 80 but on the air it was 1.1 to 1 also the same on forty.I may be getting rf from WFAN broadcat
station about two miles away (I can see the tower looking down the street)..
I called CQ on 3820 and i was heard in western Ontario.The band conditions
were not that good ...
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