[sarcmembers] Re: SARC Tower and Dish move...
- From: "Eric Lemmon" <wb6fly@xxxxxxxxxxx>
- To: <sarcmembers@xxxxxxxxxxxxx>
- Date: Sun, 10 May 2009 09:02:10 -0700
In order to rule out any problems with the feedline and connectors, perhaps
it would be prudent to make a measurement right at the antenna. I recall
Bob Harrison mentioning that the pigtail right at the antenna was equipped
with a small connector that he couldn't readily identify. If it is a TNC or
similar-size connector and is suspect, I can make up a new pigtail with
RG-400/U cable.
73, Eric Lemmon WB6FLY
-----Original Message-----
From: sarcmembers-bounce@xxxxxxxxxxxxx
[mailto:sarcmembers-bounce@xxxxxxxxxxxxx] On Behalf Of jportune@xxxxxxx
Sent: Sunday, May 10, 2009 8:31 AM
To: sarcmembers@xxxxxxxxxxxxx
Subject: [sarcmembers] Re: SARC Tower and Dish move...
My phone is 805-406-6176. But on a conventional SWR bridge you should not be
getting high SWR. So if you are, you do have a problem which is not due to
the basic design of the antenna. Other than that I really do not have any
other suggestion. Call if you wish, though.
John W6NBC
----- Original Message -----
From: george bernard <mailto:gbernard@xxxxxxxxx>
To: sarcmembers@xxxxxxxxxxxxx
Sent: Sunday, May 10, 2009 8:26 AM
Subject: [sarcmembers] Re: SARC Tower and Dish move...
john, i think you are correct. can you call me on home fone?
805-688-6324 and we can discuss what to do about this $1500 antenna? how do
we use it? do we just have to tolerate the high swr? george
santa barbara, ca web page is
www.balanceindustries.com for my company cell 818-370-9407
________________________________
From: jportune@xxxxxxx
Sent: Sunday, May 10, 2009 8:22 AM
To: sarcmembers@xxxxxxxxxxxxx
Subject: [sarcmembers] Re: SARC Tower and Dish move...
Rember basic radio theory. A log-periodic is basically a
NON-resonant antenna. So "some" instruments may not see it correctly. But on
a basic SWR bridge is should show low SWR on any requency within its range.
----- Original Message -----
From: george bernard <mailto:gbernard@xxxxxxxxx>
To: sarcmembers@xxxxxxxxxxxxx
Sent: Sunday, May 10, 2009 8:09 AM
Subject: [sarcmembers] Re: SARC Tower and Dish move...
john, do you think that a log periodic antenna might not
resonate on any ham bands? it is covering 50-1300 mcs so maybe
it doesnt dip like we expected it to on 144.2? perhaps i
should just call ted henry at hrc and purchase a 15 element yage for that
tower/rotator and call it quits with the log periodic? it worked fine for
me in goleta on six and two meters and also on 432.12 ssb. thank you for
donating the use of your 70 amps for this rig. we need to tell all members
not to run power up past 300 watts as you recommend and also
how do you want to proceed on the landwehr preamp which is
in the workshop area? btw i got the ultrasonic bird repeller installed in
my airplane hangar at smx airport yesterday. it is made by Bird-X.com
company of chicago, cost was only
$249. regards, george bernard w6nre
PS: the photo of the explorer sheriff scouts who are using
my donated "black box uhf radios" on 460.275 and .325 were useful by
visiting police officers from other jurisdistricts working the fire.
sheriff brown allowed us to program channels 1-7 to the same freqs as the
regular motorolas which his peole carry. i bought 24 of them and a computer
to program the freqs. channels
8-16 are gmrs channels for the kids to talk with each other.
these are only $150 each so if they fail we delete the serial number and
trash the radio. if one gets lost we dont worry about it.
santa barbara, ca web page is
www.balanceindustries.com for my company cell 818-370-9407
________________________________
From: John Maetta
Sent: Sunday, May 10, 2009 7:22 AM
To: sarcmembers@xxxxxxxxxxxxx
Subject: [sarcmembers] SARC Tower and Dish move...
All,
Yesterday, with the help of Bob, W6RFH, we were able to
reposition the EME dish and portable tower. The new locations allow much
shorter control and hardline runs to the operating positions. My special
thanks to Bob, for his expertise in delicately moving of the fully loaded
EME tower.
www.n6vmo.com/arpics/SARCTowerandDishMoveMay92009/index.html
I have loaned SARC the use of my Astron RS-70 powersupply to
power the TE Systems 144MHz amplifier. It is modified to power and provide
cooling air to the amplifier.
Later, W6NRE arrived and we discovered during testing, that
the log periodic antenna exhibited high SWR on 144.200MHz We also noted
that the antenna was not resonate on any amateur band or frequencies in the
VHF range. The log periodic antenna was taken down for further
troubleshooting and the tower is currently laying flat on the SARC roof.
The 1.29GHz amplifer has new cooling water and tested to 200
watts output, it should be ready for 1.2Ghz EME operation by June 6th.
Hopefully, after the monthly meeting, it can be successfully demonstrated by
providing our first 1296MHz EME contact.
This past week, I noted an ad on QTH.com for a almost new
12' parabolic TVRO dish. The dish is for sale and located in Solvang. I
emailed the seller and asked if he had not sold it, would he be interested
in donating it to the club. He happily agreed. If it becomes available, and
meets with the board's approval, along with focal and mounting requirements,
I will meet with him to transport it to the club, swap it out with the
current 10' dish. The 10' dish will then leave for the dump, unless a club
member wants it.
The new dish will provide ~50% more reflective surface area
than the 10' dish. This extra surface area will add ~2.8dB of gain,
effectively almost doubling the ERP and adding ~1/2 S-Unit of received
signal strength.
73
John
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