[sarcmembers] Re: SARC Tower and Dish move...
- From: "ab6du1@xxxxxxxx" <ab6du1@xxxxxxxx>
- To: sarcmembers@xxxxxxxxxxxxx
- Date: Mon, 11 May 2009 13:40:47 GMT
GM all. Looks like the antenna issue is closing successfully, nice work all.
A note on the corrosion problem: In Torrance, we had the same problem, even
when several miles inland. Plain old water based house paint, usually used
white to avoid added pigments, works well. I was able to test it for losses,
and once dried, were negligible up to 2.5 GHz or higher. One successful antenna
set survived over 10 years this way. We used brushes, spray, or mittens to
apply the paint, as befit the need. A bit messy, but it did the job. Also, a
can of spray Rustoleum came in handy for touch ups and small areas. And don't
forget the usual anticorrosion cream when first assembled, to prevent galling.
Dave, AB6DU
PS, the trw club even painted their towers, just to do things right.
---------- Original Message ----------
From: "george bernard" <gbernard@xxxxxxxxx>
To: sarcmembers@xxxxxxxxxxxxx
Subject: [sarcmembers] Re: SARC Tower and Dish move...
Date: Mon, 11 May 2009 07:16:54 GMT
fyi to all, i have decided to order another log periodic antenna and donate
it to the club. dave is correct, i personally think it is an important thing
to have in a vhf station in addition to band specific antennas. consider it a
done deal and dave can give me a 501c3 paperwork to file with IRS.
tonite i was at the station using the 736 barefoot and contacted some 7 or 8
stations using the circular polarity antenna.
they were from san diego to bakersfield (a 10 watter station). also, i heard a
hawaii beacon on 144.170 and when i turned the antenna to west it gained 2 s
units on the
736. is it possible that i was actually hearing a hawaii beacon from kh6hme on
cw? or am i dreaming. my beam was headed ESE when i heard it and when i
turned it to 270 degrees it jumped up 2 units. i called cq dx on 144.1 for a
while but no results. i cant wait till we get the landwehr preamp mounted on
the 2 m
horitonzal antenna (and rotor working also) i will be back on wednesday
evening at 7:30 pm for two nets one on 144.210 and one on 144.240, one in
santa barbara and one in LA (ki6ff and n6htk) does anyone know htk? also
there is a 432.12 net on thursdays for ssb. we can try that later when we get
the 5130 installed. we need to get a better, more user friendly lock on the
gate, any ideas???? also i saw a fox or some animal on the north side of our
facility inside the fence? what was it?
looked to big for racoon. regards,
george bernard
ps: daves time is too valuable to be screwing aroung with corroded antenna, he
can do something more important, that's why i am replacing the 5130.
santa barbara, ca web page is
www.balanceindustries.com for my company cell 818-370-9407
-----Original Message-----
From: David Dowler
Sent: Sunday, May 10, 2009 10:19 PM
To: sarcmembers@xxxxxxxxxxxxx
Subject: [sarcmembers] Re: SARC Tower and Dish move...
It is my assumption that the person that originally bought the antenna
did so because of its unique characteristics. Apparently, the same
person still has the same thing in mind. I think this is less of a
question of deciding what antenna we want, but more a question of if we
want to accept the one that might be given us to replace this one.
Dave KA6BFB
jportune@xxxxxxx wrote:
> Please, endure an opinion. I have never been a fan of log periodic
> antennas. They yield relatively poor gain compared to yagis. Yes they
> have great bandwidth, but that bandwith has a BIG down side. It
> naturally causes MUCH more front end overload than an equivalent tuned
> antenna onone band. Therefore, if broadband is desired for a general
> puprose testing antenna, that big discone Dave recovered is probably
> as good a compromise. If one needs gain, then go to a yagi or a quad,
> not a log periodic. So much for mouthing off. So if we can repair this
> one, fine, in my not-so-humble opinion, I personally wouldn't spend
> money on a replacement that won't really give us that much
> performance. As we all know, even a dummy load "gets out," and I
> suppose some ham has gotten his DXCC on one.
>
> John W6NBC
>
> ----- Original Message ----- From: "Eric Lemmon" <wb6fly@xxxxxxxxxxx>
> To: <sarcmembers@xxxxxxxxxxxxx>
> Sent: Sunday, May 10, 2009 6:29 PM
> Subject: [sarcmembers] Re: SARC Tower and Dish move...
>
>
>>
>> Dave,
>>
>> Thank you for bringing your antenna-repair expertise to bear on the
>> log-periodic problem. I guess we should not be surprised that
>> antennas do
>> not last forever in this climate! When we dismantled the Wilson
>> tri-bander
>> for PM, several years ago, we found a lot of corrosion and loose
>> connections. Not many antennas are built well enough to "install and
>> forget."
>>
>> 73, Eric Lemmon WB6FLY
>>
>>
>> -----Original Message-----
>> From: sarcmembers-bounce@xxxxxxxxxxxxx
>> [mailto:sarcmembers-bounce@xxxxxxxxxxxxx] On Behalf Of David Dowler
>> Sent: Sunday, May 10, 2009 5:37 PM
>> To: sarcmembers@xxxxxxxxxxxxx
>> Subject: [sarcmembers] Re: SARC Tower and Dish move...
>>
>> John
>>
>> I went up and played a bit with the log periodic today. The connection
>> to the coil in back were corroded beyond belief. A quick check with an
>> ohm meter showed one side was totally floating. I finally got the coil
>> off and spent some time cleaning the connections, and put it back
>> together. The I discovered the the place where the feedline actually
>> meets the antenna had a bad press fit. I cleaned that up but I could
>> tell the connection was intermittent. since the press fit was with
>> copper, I dabbed a little solder on the other side of where it was
>> fitting. I knew I could not solder the aluminum, I was just trying to
>> temporarily make a connection of any kind to the center of the feed
>> line. It worked and the connection was constant, and the SWR was
>> constant, but it was constantly bad. It now worked in the 440 Mhz and
>> (which it did not before I started) with a good SWR, but it was not
>> happy on 2M or 6M. That is where I left it. I might return to it later.
>> George was discussing getting a new antenna while I was there, so I'll
>> see what happens.
>>
>> Dave
>>
>> John Maetta wrote:
>>> George,
>>>
>>> With all the amateur expertise we have in our club, troubleshooting
>>> the log periodic should be easy, so there is no need to order a new
>>> one.
>>>
>>> Let us know how you net activity goes.
>>>
>>> 73
>>>
>>> John
>>>
>>>
>>> ----- Original Message ----- From: "george bernard"
>>> <gbernard@xxxxxxxxx>
>>> To: <sarcmembers@xxxxxxxxxxxxx>
>>> Sent: Sunday, May 10, 2009 9:32 AM
>>> Subject: [sarcmembers] Re: SARC Tower and Dish move...
>>>
>>>
>>>> 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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>>>>
>>>> _______________________________________________
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>>>
>>> _______________________________________________
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>>
>> _______________________________________________
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>
> _______________________________________________
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