JohnI 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 144.240at 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 additionalpenetrations, not only on the west side for the dish system, but also a fewmore into the radio room and the workshop. I am awaiting delivery of aspecial 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 willdonate 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 foranother 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 youshould 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 donot 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 homefone? 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 aNON-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 antennamight not resonate on any ham bands? it is covering 50-1300 mcs so maybeit 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 allmembers 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 repellerinstalled in my airplane hangar at smx airport yesterday. it is made byBird-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 thefire. sheriff brown allowed us to program channels 1-7 to the same freqs asthe 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 witheach other. these are only $150 each so if they fail we delete the serialnumber 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 ableto 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 loadedEME 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 duringtesting, that the log periodic antenna exhibited high SWR on 144.200MHz Wealso noted that the antenna was not resonate on any amateur band orfrequencies in the VHF range. The log periodic antenna was taken down for further troubleshooting and the tower is currently laying flat on the SARCroof. The 1.29GHz amplifer has new cooling water andtested to 200 watts output, it should be ready for 1.2Ghz EME operation byJune 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 inSolvang. I emailed the seller and asked if he had not sold it, would he beinterested 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 thedump, unless a club member wants it. The new dish will provide ~50% more reflectivesurface 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 receivedsignal strength. 73 John _______________________________________________ You have received this because you are subscribed to the Satellite Amateur Radio Club Members Mailing ListTo post on the mailing list, simply send email to sarcmembers@xxxxxxxxxxxxxx This mailing list willonly accept email from subscribed members so SPAMMERS will not get your email addressTo unsubscribe, send an email to sarcmembers-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at: //www.freelists.org/cgi-bin/lsg2.cgi_______________________________________________ You have received this because you are subscribed to the Satellite Amateur Radio Club Members Mailing ListTo post on the mailing list, simply send email to sarcmembers@xxxxxxxxxxxxxx This mailing list willonly accept email from subscribed members so SPAMMERS will not get your email addressTo unsubscribe, send an email to sarcmembers-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at: //www.freelists.org/cgi-bin/lsg2.cgi_______________________________________________ You have received this because you are subscribed to the Satellite Amateur Radio Club Members Mailing ListTo post on the mailing list, simply send email to sarcmembers@xxxxxxxxxxxxxx This mailing list willonly accept email from subscribed members so SPAMMERS will not get your email addressTo unsubscribe, send an email to sarcmembers-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at: //www.freelists.org/cgi-bin/lsg2.cgi
_______________________________________________ You have received this because you are subscribed to the Satellite Amateur Radio Club Members Mailing List To post on the mailing list, simply send email to sarcmembers@xxxxxxxxxxxxxx This mailing list will only accept email from subscribed members so SPAMMERS will not get your email address To unsubscribe, send an email to sarcmembers-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at: //www.freelists.org/cgi-bin/lsg2.cgi