Re: Topband: Preferred Choke Baluns
Jim, Thanks for your response to my post. I accept your reasons for what you do and have recommended. However, for all my applications, I stand by my statement. For me, many, many, many installations as I described have worked, and continue to WORK, LIKE A CHAMP. I have done loss measurements and also checked for the possible problem you propose. In all cases, nary a problem. YMMV. 73 de Milt, N5IA -Original Message- From: Jim Brown Sent: Monday, March 07, 2011 12:49 PM To: Milt -- N5IA ; 'TopBand' Subject: Re: Topband: Preferred Choke Baluns On 3/6/2011 9:32 PM, Milt -- N5IA wrote: > And I make all of my choke baluns for 160 Meter energy from 30 turns, 6" > in > diameter, of whatever cable it is. This is coaxial leads as well as rotor > cables, etc. Works like a champ. > I suggest that you MEASURE the effect before you say that it "works like a champ." There are HUGE differences between what you suggest as opposed to multiple turns of the coax around five #31 cores. Your choke is inductive, so it can resonate with a feedline that is capacitive by virtue of its length. The ferrite choke is resistive, has a MUCH greater choking impedance, and cannot resonate with the feedline. 73, Jim Brown K9YC - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1204 / Virus Database: 1435/3488 - Release Date: 03/07/11 ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: T30RH
Can any of you topband gurus/big guns contact 4A4A /T30RH/N0TG/CYO and ask them to spread out . Last night was a zoo . 4A4A 1824 up 1 to 2 T30RH 1826.5 never did hear up or down N0TG/CY0 1826.1 down 1 -2 does not work very well - guys sending Up Up because someone calling another station on top of T30 etc etc . Cant tell the players . Hank K7HP ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: T30RH signals last night
T30RH signals on 160m were significantly stronger last night than the night before. The band has got a bit busy with the crowds calling T30RH and 4A4A.. Hope many of the top band gang have been able to work Jacek& Jacek. Sorry to hear about the challenges on site, something hard to imagine for most of us in our comfy armchairs! The team is doing FB job, wish them all the best 73 de VK2CCC www.qrz.lt/ly1df ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Topband: T30RH
I'v got at last longer e-mail from Jacek...so a few details : The first place which was booked was rented for a long term and they could not get it. They proposed another one which had not enough place for antennas at all. Another hotel Otinatai was waiting for them but after watching from the outside, it turned out that there is no space for antennas larger than 40m! They had to look for something else. They were taken to the resort, supposedly the best on the island. This is QTH used previously by N1MEC and T30R. It looks great for tourists but antenna conditions are difficult. The antenna is located in good place practically in the ocean, but erecting it was very risky, blowing 24 / 7 strong Passat is making difficult even walking, let alone putting the 18m antenna! Because of all this work with antennas he has crippled feet ...has problems with walking , has sunburn and is cold... The area has very limited space for antennas and so far Jacek was not able to make 40 or 30m antenna..for receiving he made FO0AAA loop but it is almost the same as vertical but is picking interferences when other Jacek T30AQ is active...even they have Dunestar filters. Internet is VERY slow 4kB/s...and very expensive.. As I wrote previously on Wednesday the antenna box blow up and Jacek is not able to use his vertical on 80m...several times a top hat was disconnected ( heavy wind) and Jacek was repairing it during a night... The noise level on both antennas ..vertical and loop is about 1S but QRN is S8-9 ...during nice weather! Because of it Jacek has problems to copy stations transmitting fast CW...PLEASE USE THE SAME SPEED AS HE IS USING..18 WPM ! He is trying to be each his SR and SS...also SS/SR in EU / US ...unfortunatelly Jacek can't sleep too much as other station T30AQ is active only SSB and they are in the same room They also learned that they must leave their Bwia (hut) for 2 days and move to another, it creates additional problems, but luckily they do not have to remount the antenna on 160m but others, unfortunately, yes. A second vertical -for 80m (12m) is mounted and tuned for SSB ...maybe it will be tuned for CW bandlater. 73 GL Rys SP5EWY ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Preferred Choke Baluns
Charles, I also use the same choke construction as Tod, K0TO. Six turns through 5 Fair Rite No. 31, 2.4" dia ferrite cores. Works very well, essentially zero loss and no heating issues. Note, put the Pl-259 on after you make the choke coil or you will be able to only get about 4 turns ! 73, Bob K6UJ On Mar 6, 2011, at 9:32 PM, Milt -- N5IA wrote: > And I make all of my choke baluns for 160 Meter energy from 30 turns, 6" in > diameter, of whatever cable it is. This is coaxial leads as well as rotor > cables, etc. Works like a champ. > > Milt, N5IA > > > -Original Message- > From: Tod - ID > Sent: Sunday, March 06, 2011 2:15 PM > To: 'Charles Moizeau' ; 'Topband' > Subject: Re: Topband: Preferred Choke Baluns > > Charles: > > I make 160 meter RF Chokes [Choke Baluns] by running six turns of coax > through 5 cores of Fair Rite type 31 [2.4 in diameter cores]. Five turns and > six cores will also work. > > > Tod, K0TO > > > > -Original Message- > From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com] > On Behalf Of Charles Moizeau > Sent: Friday, March 04, 2011 9:52 AM > To: Topband > Subject: Topband: Preferred Choke Baluns > > > I'd be grateful to learn the preferences of users of these devices. > > My set-up is 50-Ohm, 0.405" diameter (Wireman X-4XL) coaxial cable, > underground, but within electrical pvc conduit. This attaches through a > PL-259 to a DX Engineering radial attachment plate. The antenna is an > inverted L with its base fed just through a variable capacitor (set for my > antenna at ~ 255 pF) . > > I have given thought to chopping the PL-259, stringing a bunch of Palomar's > ferrite beads on the coax and then re-attaching the PL-259. > > However, an alternative would be to insert a manufactured or home-brewed > balun, toroidal or solenoidal, between the radial attachment plate's SO-239 > connector and the variable capacitor. > > Physical space is not a problem because I've discovered that the DXE radial > attachment plate will fit nicely into a 12" x 12" x 6" heavy-duty gray pvc > electrical box ($33 at Lowes). I plan to revise the existing and quite > messy above-ground set-up so that the radials will be inserted into the box > through tight-fitting and caulked notched holes in the four top edges, just > below where its cover will fasten, with their solder lugs attached to the > plate 180 degrees opposite from the conventional configuration. In this way > the whole business can be buttoned up tightly and buried, with just the > antenna's attachment point and the capacitor's adjustment shaft sticking up. > Perhaps this plan will be inspirational to others. > > I'd prefer to see any choke balun recommendations posted to this list rather > than sent directly, so as to share the "wealth". > > Tnx es 73, > > Charles, W2SH > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > > - > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1204 / Virus Database: 1435/3486 - Release Date: 03/06/11 > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
