[amsat-bb] Antennas

[Douglas Anoman]

Hello All,

 i've been reading some of the e-mails about oscar antennas. Well i needed to 
get a word out about Gulf alpha antennas i just received my set about five 
weeks ago and I am very happy. I was going to go with M2 but price and 
craftsman ship turned me away. Call Pete at gulf alpha the work is perfect and 
the antenna is right on the money and cheaper than M2 and better craftsman 
ship... 

Thank You
Douglas Anoman
KC9MLN
Amsat #37043




___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

[amsat-bb] antennas

[Dads]

Hi : I have owned and tried nearly antenna on the market.
I have used patch feed , dishes. eggbeaters, yagi,s 
etc.
I have had Cushcraft, Hy gain , M2,  and KLM , s
 The best overall performance antennas are KLM, s .
  I use switchers on all the antennas too.
Jerry w0sat 

___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

[amsat-bb] Antennas

[Rich/wa4bue]

Who was closing out some omni directional multi band antennas for VHF UHF.

Rich 


W4BUE


___
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

[amsat-bb] Antennas: How High?

[harry]

Guys,
 
I want to upgrade from my hand held Arrow to something permanently mounted 
outside with and Ele/ Az rotor.
 
I have a single story home with roof peak at about 22 feet.  I can easily mount 
a 10' - 20' mast directly outside the shack anchored in concrete and bolted to 
my roof eaves.
 
If I use two  masts sections I will get a net height of about 17' which means I 
will be "looking" through my roof on the lower easterly orientated passes.  
Gaining the additional height to completely clear the roof line will be 
increasingly problematic.  How much should I be concerned about this, etc?
 
I'd like some real world feedback / suggestions.
 
Thanks in advance.
 
73 de harry, W6DXO
 
 
___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

[amsat-bb] Antennas for sale

[David - KG4ZLB]

  I have the M2 440-6SS and the M2 2M-3SS for sale - ideal for confined 
spaces or areas where the condo commanders prowl - see here 
 and follow the links to the 2 Meter 
and 70 CM pages for details.

$107.99 shipped anywhere in the lower 48 (Shipping included)

Contact me off list, thanks!

David
KG4LB


___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

[amsat-bb] antennas for portable use

[Thomas Doyle]

I did a lot of comparisons between my Elk and Arrow II. My results
were exactly the same as those of WD9EWK/VA7EWK but I was never sure
why the Elk performed better. Comparison tests I have been running
between a DIAMOND A430S10R and an Olde Antennas 7CP-70cm have given me
an insight as to why the Elk works so much better.

The tests between the Diamond and the Olde were the most inconclusive
tests I have ever run until suddenly my ancient grey cells managed to
figure it out. The Diamond has a longer boom which gives it more gain.
The Olde has a very short boom but is circularly polarized. I had them
mounted on opposite ends of the cross boom with a switch for quick
comparisons. During part of a pass the Diamond would work  better.
During other parts of the pass the Olde would work better.

The chart at the top of the SV1BSX web page holds the answer.
http://sv1bsx.50webs.com/antenna-pol/polarization.html
When the orientation of the sat antenna lines up with the Diamond it
works better and continues to work better until the sat rotates to the
point where the cross polarization loss cancels the gain advantage the
Diamond has over the Olde at which point the Olde works better...

What has this to do with the Elk - Arrow comparison. Since the 2M and
70cm antennas on the Arrow are mounted at right angles to one another
we have a problem when working linear polarized sats. If the Arrow  is
turned to maximize the downlink signal it is automatically turning the
uplink antenna to the angle that will maximize the uplink cross
polarization loss of up to 30 dB.

I do my testing on the linear sats and listen to my own downlink
signal.  When the Arrow is rotated to maximize the the received signal
my best guess is that it is turned  off the angle of the sat antenna.
This would spread the cross polarization loss between the uplink and
downlink antennas. The exact offset angle would depend on transmit
power, receive sensitivity and a ton of other things.

There is nothing wrong with the Arrow II it just can not work as well
as the Elk on linear sats unless you have a quick wrist and rotate the
antenna between transmit and receive. Even if you have very quick
wrists resulting from a miss spent youth playing foosball there still
is a problem. Trying to figure out the angle to turn the antenna
during transmit is all but impossible. Since the sat is rotating the
angle for transmit is not always 90 degrees from the angle for
receive. All antennas work to some degree and all this stuff is only
important if you are trying to maximize performance.

73 W9KE Tom Doyle


On Mon, Jul 16, 2012 at 3:28 PM, Patrick STODDARD (WD9EWK/VA7EWK)
 wrote:
> Norm,
>
> I use an Elk log periodic for AO-7 and all my other satellite work. I am
> able to work passes to the predicted LOS time, subject to local
> surroundings.
> I was only able to work down to 4 or 5 degrees elevation with my Arrow
> dual-band Yagi, before I switched to the Elk. You can see this setup
> in action working satellites - including AO-7 mode B - in some of
> my videos at: http://youtube.com/va7ewk
>
> For AO-7 in mode A, the Elk is my 2m antenna, and a Buddipole dipole
> on its tripod and telescoping mast is used for the 10m downlink.
> Since this requires more setup, and the 10m downlink is weaker
> than the 2m downlink, I don't work mode A very much.
>
> 73!
>
>
>
>
> Patrick WD9EWK/VA7EWK
> http://www.wd9ewk.net/
>
>
> On Monday, July 16, 2012, Lizeth Norman wrote:
>
>> Hi all!
>> Just wanted some comments as to what ops are using for AO-7 portable.
>> More importantly, some info on how they perform near loss of signal.
>> Pictures of antenna arrays would be greatly appreciated.
>> Norm n3ykf
>> ___
>> Sent via AMSAT-BB@amsat.org . Opinions expressed are those
>> of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>
> ___
> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb



-- 

Sent from my computer.

tom ...
___
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

[amsat-bb] Antennas For AO-7 Mode A

[B J]

I'm looking for a suitable antenna that I can use to operate over AO-7 in
mode A .  The main requirement that it be hand-held.

I've looked on the Internet and, so far, I haven't found any off-the-shelf
antennas.  I did, however, find several websites that have instructions for
home-brew designs but none were specifically for mode A.

One possibility that occurred to me is to combine 2 different types, such as
an eggbeater for 2 m and a hand-held HF loop for 10 m.  One drawback that I
see for this arrangement is that it might be too big or too heavy for it to
be practical as a hand-held unit.

Does anyone know of a commercially available mode A antenna suitable for
hand-held operation or know of a home-brew design for one?

Thank you.

73s

Bernhard VA6BMJ @ DO33FL
___
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

[amsat-bb] antennas for AO-51 V/S

[John Heath]

Enjoy V/S on AO-51 

Visit www.uk.amsat.org and go to the shop.
There you will find an easy build complete kit for a patch antenna ideal for 
AO-51

73 John G7HIA
___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb