Thanks for the all replies. But now my M2 2800 rotor has stopped working. One
step forward, two backward.
Will call M2 in the morning and see what they have to offer. I've checked
everything there is to check and read through countless posts in the Tower Talk
archives. Don't have an O-scope anymore to check the pulses.
I'll post something to Tower Talk. Maybe someone can relate to what I'm seeing.
73, Don
-----Original Message-----
From: rtty-bounces@contesting.com [mailto:rtty-bounces@contesting.com] On Behalf
Of Don Hill AA5AU
Sent: Saturday, December 10, 2005 4:08 PM
To: 'RTTY'
Subject: [RTTY] D40 Perfection!
Today was the perfect day for installing an antenna. There was absolutely no
wind. It was perfectly calm.
With the help of my neighbor, Robbie, I installed the D40 on top of my new 65'
tower. The D40 is at about 74'. I did not install it on its own rotator.
I installed a new run of RG-214 down the tower and into the shack, along with
the M2 rotor cable. I was a little anxious because I did not know for sure what
the SWR would be. The instructions say SWR results are erroneous when near the
ground. Last weekend when I had it at 17', the antenna appeared to be resonant
down below 7000 Khz with an SWR of about 1.5:1 at 7000 Khz. Since experience
tells me that antennas tend to resonant lower in frequency when near the ground,
I could only hope I got the measurements right. I had double and tripled
checked them.
So I was very happy to find my resonant frequency at 7060 Khz, which is only 20
Khz off from what I had tuned it for. The SWR is flat at 7060 Khz and is below
1.5:1 from 7000-7120 Khz. This is perfect for me since I rarely operate SSB
(the PW-1 will certainly tune the higher SWR up on the phone band).
Not only is it tuned right, it looks awesome up there.
Scroll to the bottom of this page
http://aa5au.com/antennas/rebuild/higher_tower.html
Now I have to build and install an A3S below the D40. That will do for the
Roundup. Then I'll try to spice it up a bit with a 3 element SteppIR in the
spring. The lead time on the SteppIR antennas 2-3 months and I wouldn't have
received it in time for Roundup.
73, Don AA5AU
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|