Re: First time loop winder
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"Very well put. I am the one who asked the loop winding question, and I
will certainly post my results when I am finished. After a long hiatus from MW
listening, I have gotten back into it over the last year or so with a vengeance
thanks to the good people in this group and the purchase of a Tecsun 300, 310
and 380, and I will probably get amother 380 to do a stealth mod once I get the
7.5" transplant done,"
Hi Barry,
Thanks for your generous words, and as you proceed to construct your
7.5" loopstick PL-380 and Stealth PL-380, please feel free to ask for any
material or assistance, so that you can be just as thrilled with the DXing
performance of the models as me.
The 36" Collapsible-frame PVC Loop article is a top- priority project here
(one of about five, currently :-) which has already been partially completed.
The fascinating results of hot-rodding the PL-380 model have temporarily
side-tracked this effort, but I can assure you that the DXing performance
of these pack-away 36", 48" and 60" tuned passive loops provides just as much
DXing "bang for the buck" as anything ever coming out of this
fanatical tinkering shack. Thanks for your interest!
73 and Good DX, Gary
In a message dated 1/22/2010 11:17:28 A.M. Pacific
Standard Time, bgelb2@... writes:
John,
Very well put. I am the one who asked the loop
winding question, and I will certainly post my results when I am finished. After
a long hiatus from MW listening, I have gotten back into it over the last year
or so with a vengeance thanks to the good people in this group and the purchase
of a Tecsun 300, 310 and 380, and I will probably get amother 380 to do a
stealth mod once I get the 7.5" transplant donehn,
. Sony 2010 purchased new in 1992 from Gilfer in New Jersey (remember them?) which has had the Kiwa wide filter and audio mods done, and a rebuilt Hammarlund HQ-180AX, which should outlive me (not that I'm that old, I'm 55) as it is an absolute tank. I am handcuffed as far as antennas go since I have a small yard, so I have a Wellbrook 330s, a Quantum Loop, a CC Crane Twin Coil Ferrite and a Select-a tenna. I also want to try my hand at a PVC loop this summer from Gary DeBock's articles, particularly the 36" collapsible loop. Also, being in Northeast Queens, NY, about 2.5 miles from 50k blowtorches WCBS 880 and WFAN 660 doesnt help, but I do my best. I also have a Again, thanks to John Bryant and all the other wizards in this group. Barry Gelb Bayside, NY --- In ultralightdx@ > > This recent exchange with, primarily, Gary DeBock > in suburban Seattle-Tacoma and Roy Dyball in > Australia helping an Ultralighter who was > beginning his first ferrite rod-coil winding is a > great example of what makes this group so > special.... great positive attitudes and a very > real willingness to help each other over our > personal rough spots. Bravo, guys!!! > > Over 25 years ago, when I was getting back into > radio after a 25 year hiatus, Gerry Dexter, who > literally wrote the book on SWBC and MW QSLing > told me "You know, John, it's not the great DX > catches or the QSLs, but rather the many friends > that I've made that really make the hobby great!" > At the time, I was just back in and climbing up > the ladder of SWBC countries QSLed and I said "Yeah, right, Gerry!!!" > > Geez, old Gerry was absolutely right! I've made > a passel of new friends here, that I value very > much.... and renewed many old ones, too... on top > of that, I've learned huge amounts about various > aspects of Ultralighting and, really, radio in general and had a BARREL of fun. > > I've got to get another cup of coffee and start > on over 25 more DXing award certificates that > have been checked and verified by Rob Ross this > week.... but it sure is nice to stop for a few > minutes to think about the bigger picture. It is > very nice to have you all around. It makes my > life much richer. Yours, too, I hope! > > John Bryant > Moderator > > > > > > > > > At 03:18 AM 1/22/2010 -0500, you wrote: > > > > > > > >In a message dated 1/21/2010 11:56:01 P.M. > >Pacific Standard Time, roy.dyball@. > > > >Also remember if you are dynamically tuning your > >loopstick by unwinding turns or repositioning > >it, that with every change you make to the > >loopstick you must steep off the frequency you > >are on and then steep back again, this gives the > >Si4734 a chance to update its varactor and > >choose a new corresponding value for the change you just made. > > > >Cheers Roy. > > > >Hello Roy, > > > >Thanks for mentioning this. In the dynamic > >tuning of the PL-380 "stealth models" (a 40/44 > >Litz wire coil of about 433 uh inductance on the > >stock ferrite bar), I found this was very true. > >In both of my two models, the original coil of > >about 500 uh had an Si4734 varactor lock-up > >issue on the high AM band frequencies, and coil > >turns needed to be subtracted one by one until > >the radio had a sudden boost of sensitivity on > >1700 kHz. (There was no option to use a Slider > >coil for loopstick tuning purposes, since the > >flat stock ferrite bar was geometrically unsuitable as a Slider coil base). > > > >After the sudden rush of increased 1700 kHz > >sensitivity on the PL-380 when the inductance > >was lowered to 433 uh, it was necessary to move > >off of the frequency and then back to 1700 kHz, > >to judge the final RSSI increase after the > >modification. The dynamic signal > >"turn-subtracting" strategy (to lower the coil > >inductance to a level acceptable to the > >varactor) was a weird idea that ended up giving great results. > > > >73, Gary > > > > > > > > > |
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