The difference for me has been the "out of the box" nature of the FLG100 solution. There are costs and costs, and time has been a big one of them in my years as a DXer. And once the FLG100 is up, there's been no tinkering with connections.
One thing that has made twisted pair not "out of the box" for me has been the lack of remotely weatherproof connectors at a price that is not at least a down payment on a FLG100 (and yes, the BNC on the coax is not totally weatherproof, but a few inches of rubber tape is pretty close). If you have something that works well with CAT5 (banana plugs don't count; I've been troubleshooting with you, remember), then I am all ears. I think we discussed feed-through glands at one time. Is that what you have in mind?
best wishes, Nick At 11:58 07-10-16, you wrote:
I do love the way the varied interests in this hobby are propagated through this club from member to member and I'm grateful for the knowledge and experience that's so freely shared.One baby elephant in the room is Mark's antenna "ambience." If his QTH there in the Land O' Goshen is in a field of electrical interference (and perhaps significant local RF?), the noise gathered by the lead-in may be an issue best resolved not by common-mode choking but by "balancing" the feed-lines.I've bored folks to death by espousing the balanced twisted-pair approach, in the form of Category cable (Cat 5, Cat5e etc) with an impedance around 110 ohms. IMHO such a BALANCED transmission line pretty much eliminates stray pickup without the need for common-mode choking. Cat-5 sells for around $45/1000 feet...although if the budget allows, I'd go for STRANDED Cat-5.As I type this I'm watching the Perseus on a D-Kaz facing mostly west and watching Seattle rolling in, here in North-Central Minnesota. Using a 9:1 transformer and Cat-5 with a DXE RPA-1 in the shack and watching a noise floor of -111 dbm in 5 kHz, after the amplifier's 15 db gain.An absolute YES to the Vactrol approach for the null component. The design for that circuit somewhat obviates the potential for stray common-mode pickup, so coax may work FB, but again...twisted-pair is so easy to implement.As to mounting the RF amplifier at the antenna: I've tried the FLG and the DXE, planting them both at the antenna and in the shack. Like Don Moman, I can't really find any significant improvement...though in theory antenna-mounting of the amplifier is the better approach; weathering issues notwithstanding. (You would however, need a balancing transformer after the amplifier if you fed twisted-pair.)A winterized installation at my site would include twisted-pair lead-ins, a 9:1 transformer and a Vactrol control, mounted in weatherproof boxes and the amplifier in the nice warm shack. Amazon fans have found all sizes of weatherproof boxes and wire feed-throughs:At Amazon's greedy query, type in: "Cable Connect Waterproof Plastic Case Junction Box" and "Plastic Waterproof Cable Connectors"Decent transformers (if you don't have strong RF nearby) http://www.minicircuits.com/pdfs/T9-1.pdfNow for the famous YMMV <g> Have fun Mark; continue to share your experiences!Mark Durenberger, CPBE -----Original Message----- From: Mark Pettifor Thanks for the advice guys - much appreciated!I should also publicly thank Tim Tromp for getting me interested in the DKAZ to begin with.Mark On 2016-10-06 10:02 pm, Nick Hall-Patch wrote:Agreed. They do cost a fair amount (mind you the exchange rate with the pound isn't bad right now), but are solidly built and work very well. Money well spent.Nick At 22:17 06-10-16, you wrote:I very strongly recommend the Wellbrook FLG100LN, They go right at the antenna and replace your xfmr. Now what is picked up by the antenna is amped 22 dB whereas what is picked up by the coax is not amped at all. I have two of these and they've survived IL weather for over 3 years. 73 KAZ Barrington IL On Thu, Oct 6, 2016 at 4:29 PM, Mark Pettifor <mark@xxxxxxxxxxxxxx> wrote:> For those of you who have DKAZ antennas, which preamp do you use? Do > you > find it makes much difference whether you put it at the antenna or in > the> shack? > > I need to "finish" construction on mine. Right now, I have two 470-ohm > resistors alligator-clipped together for the null end, and a hand-wound> transformer (my first ever) on a core made of unknown material, to go > from> 940 to 50 into a 50-ohm feedline.... RG-8X, 150 feet. That is also > alligator-clipped together. It was for testing, ya know? :^) > > It's been pretty good as is, but I want to get it ready to survive the > winter. > > BTW, it's amazing the amount of noise just a short length of RG-8X 100% > shielded coax will pick up. I have it mostly on the ground, but have a> small part of the run overhead for now (30 feet?) so I don't mow over > it.> Thanks! > > Mark Pettifor> Near Goshen, INdx.com_______________________________________________ IRCA mailing list IRCA@xxxxxxxxxxxxxxxx http://montreal.kotalampi.com/mailman/listinfo/ircaOpinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officersFor more information: http://www.ircaonline.org To Post a message: irca@xxxxxxxxxxxxxxxx
Nick Hall-Patch Victoria, BCCanada
_______________________________________________ IRCA mailing list IRCA@xxxxxxxxxxxxxxxx http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@xxxxxxxxxxxxxxxx