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   Home   Help Search  
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 31 
 on: Yesterday at 07:26:17 PM 
Started by KG5EJU - Last post by W5WSS
Hello KG5EJU, A Hustler 6BTV pushing against the roof top would probably work reasonably.

You can always add radials.

The small improvement in performance by a single band 1/4 wave vertical would rarely be noticed in actual operation on the upper bands although yes noticeable on the lower bands such as below 20m.

You can work out the mechanical installation details Perhaps include a fold over bracket to tilt the antenna down for service, or tuning, and perhaps weather. .

You may have already decided on the mono band vertical consider the multi band trap vertical.

73

 32 
 on: Yesterday at 07:22:00 PM 
Started by W6UV - Last post by WA4HBK
KG4AA-ZZ is a block of callsigns under the control of the Chief of Naval Operations. When I was there (KG4HC) 1978-83 licensing authority was delegated to the Base Commander who then delegated it to the Base Communications Officer. You submitted a request to operate to the Base Commo, give a preference for callsign, and he would issue a license. The only long term licenses were the Navy Amateur club KG4AN and the Marines KG4AM.

 33 
 on: Yesterday at 07:17:01 PM 
Started by MM0NDX - Last post by KF7CSO
The equipment listed on their website is...

Radios:

- 2 x Elecraft k3 with KPA500

Icom Radio TBD

Antennas:

- GP7DX  multi band vertical  10 – 80   by sp7gxp

- Vertical dipoles 2 el   12m-17m

- CrankIR  by Steppir

 34 
 on: Yesterday at 06:40:43 PM 
Started by WB7RCL - Last post by WB7RCL
Thank you all for the replies. I have looked at the Alpha Delta DX-A but my feed point would only be 35 feet above ground. Also thought about another dipole. Just not sure how either would work at that limited height. May be I should pick up a copy of the antenna hand book. I don't think DX is a requirement I would just like to get onto 80. Been licensed since early 70's and never been below 40. I might just try a dipole since I already have the 40 and could use the same feed point fan style? Thanks for the help.

 35 
 on: Yesterday at 06:36:25 PM 
Started by W4KYR - Last post by WA2ISE
Van Gorden Engineering (Balun)

I threw one of these away... Wasn't worth it's weight in burnt PVC. 

In college at the ham club, one of the members thought that a W2AU balun was bad, because it measured shorted with an ohm meter.  I told him that's just the coils inside it, but he said it's bad, here, take it home.  So I did... Worked for me.

 36 
 on: Yesterday at 06:31:59 PM 
Started by KG7FIU - Last post by K5UNX
I dont understand why some hams don't like it when new hams ask basic questions, regardless of the license they hold. What happened to the Elmer concept?

I know some expect Extra's to know everything, but today it's not the case. I learn as a tackle projects and try new things. I can "Elmer" some beginners, while I need Elmering from others . . .

 37 
 on: Yesterday at 06:30:53 PM 
Started by WO7R - Last post by W7WQ
Back in the sixties and back, before a lot of the "technology" became such as looking at clusters, web sties, etc. we knew who was coming on, and when. And where.  A "one ringer" from a friend might be your alert.  Way back in the day, QST's column, How's Dx? had really pertinent information, rather than what it is today.  I'm not sure what, but something.  I think the point is, look at this guys modest station and shows that it isn't the song, it's the singer.

 38 
 on: Yesterday at 06:26:12 PM 
Started by KM4FMK - Last post by WA7PRC
The only way to improve the distance is to get the antennas higher at either or both ends.
Or use a vertical beam.
The advantage of a directional antenna becomes evident when you have multipath distortion. Many years ago, I was to install a FM BC receiver + antenna for background music. I used my portable "field strength" receiver and a 3-el yagi on the roof to determine optimal antenna location and aiming. As I aimed the yagi at our 35KW ERP transmitter (LOS about 30 miles away), the signal strength was good but, the recovered audio was badly distorted.

The receiver site had a STEEP hill immediately behind it. As I turned the test antenna, the signal came up higher and the distortion went away when I aimed directly toward the steep hill. That's not the first time I wound-up aiming in a different direction. Had I had a vertical (or other omnidirectional antenna), I never would've had an acceptable result.

All that said, why not ALSO buy/build a portable 2m yagi or quad? units such as the MFJ-1763 may be workable.

vy 73,
Bryan WA7PRC

 39 
 on: Yesterday at 06:25:57 PM 
Started by KJ4IGV - Last post by W7WQ
Well I cant speak for Haiti but I know when I lived in Jamaica, it was local calls for locals.  If you didn't like it, too bad. I lived there for 3 years and was always *call*/6Y5

 40 
 on: Yesterday at 06:16:34 PM 
Started by WB7RCL - Last post by WB6BYU
The important first question is who you want to work on those bands.  Vertical polarization
is often better for DX if you are limited for height, while horizontal polarization tends to be
better for more local work.

For DX, something like an inverted "L" might be a good choice - basically a wire running up
from the ground to near the top of your tower, then horizontally (or could be sloping down
somewhat) to a convenient support.  You would either need a tuner at the base, use
traps for multi-band operation, or run a separate wire for each band.

For horizontal polarization, an 80m dipole would fit in your space, and putting a 40m dipole
on the same feedpoint gives you those two bands without a tuner.  I've had good luck
adding home-made loading coils to a 40m dipole with extension wires to allow it to be
used on 160m as well, in about the same space as a 80m dipole.

One thing about an OCFD - the radiation pattern will vary depending on the band.  With
an 80m OCFD, for example, you'll have maximum radiation on 40m to the North and South,
but nulls to the East and West.  Since the direction of your antenna is relatively fixed,
your choice of antenna may also depend on your favored direction.


So a bit more information about your favored bands, directions and distances to cover
will help us to recommend an antenna to suit your needs rather than someone else's.

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