[sarcmembers] Re: SARC Tower and Dish move...
- From: "george bernard" <gbernard@xxxxxxxxx>
- To: sarcmembers@xxxxxxxxxxxxx
- Date: Sun, 10 May 2009 15:26:20 GMT
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
-----Original Message-----
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
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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