[sarcmembers] Re: SARC Tower and Dish move...
- From: "george bernard" <gbernard@xxxxxxxxx>
- To: sarcmembers@xxxxxxxxxxxxx
- Date: Sun, 10 May 2009 16:32:20 GMT
fyi, i have located the create log periodic in a catalog and it is now only
$450. it advertises a 10-12 db gain with a 15db front to back ratio. i am
willing to order another one tomorrow from henry radio and have it sent for
assy and install if the club techs think it is worth doing. i am going to the
club today with my mfj and try to size things up again. my cell is
818-370-9407 , bob harrison is supposed to be going up , too. i will try
to run the ft-736 barefoot this evening from the position
by the refrig with beam ese and see if i can get into the LA and SD nets on
144.240
at 8 PM. george w6nre
santa barbara, ca web page is
www.balanceindustries.com for my company cell 818-370-9407
-----Original Message-----
From: Eric Lemmon
Sent: Sunday, May 10, 2009 9:22 AM
To: sarcmembers@xxxxxxxxxxxxx
Subject: [sarcmembers] Re: SARC Tower and Dish move...
John,
We have plenty of 9914- the new stuff we got from DRMO- to add more
feedlines. I have a water-cooled core drill to make some additional
penetrations, not only on the west side for the dish system, but also a few
more into the radio room and the workshop. I am awaiting delivery of a
special adapter to connect a 2.5" core drill to my water injection swivel.
It should be delivered within a week.
73, Eric Lemmon WB6FLY
-----Original Message-----
From: sarcmembers-bounce@xxxxxxxxxxxxx
[mailto:sarcmembers-bounce@xxxxxxxxxxxxx] On Behalf Of John Maetta
Sent: Sunday, May 10, 2009 9:10 AM
To: sarcmembers@xxxxxxxxxxxxx
Subject: [sarcmembers] Re: SARC Tower and Dish move...
I agree with John P.'s assessment and propose the following:
In an effort to get the SARC on the 6 meter band, I will donate a 5 element
50MHz yagi to install on the portable roof tower. Along with that, I will
donate a Cushcraft 13B2 144MHz yagi for the portable roof tower.
We can troubleshoot the log periodic at our leisure, and reinstall it if
decided.
I will have a day or so over the Memorial Day weekend and will try to get
the two antennas (50Mhz and 144MHz) mounted and tested. Hopefully, I can
have it ready and use the station on 50MHz during the June VHF contest. If
someone has a 220Mhz yagi, now would be a good time to get it mounted too.
Does the SARC have enough 9913 or equivalent to make another run or two up
to the portable tower? Is the radio room penetration have enough room for
another coax or two?
In addition, we noted that SARC's the horizontal 144MHz, on coax 'B'
exhibited 2.5:1 SWR at 144.200MHz. Something else to troubleshoot in the
future.
73
John
----- Original Message -----
From: jportune@xxxxxxx
To: sarcmembers@xxxxxxxxxxxxx
Sent: Sunday, May 10, 2009 8:30 AM
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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