Hi Lee, Csaba also refers to this transformer as T2 and based on what he has said so far I suspect he is constructing something similar to the two direction beverage shown in figure 7-115 in the 5th
Hi Roger, Signal report comparisons with the modern radios that often have preamps that you can switch in or out really clouds the picture as well as the fact most stations on topband use RX antennas
Hi Roger and gang, I operated W9VW which is a pretty big contest station Saturday morning but did not get on 160 meters until 0545 UTC, and I commented to my fellow operators that conditions were abo
HI Steve, Thanks for the nice implementation comment. The portable flag front to back ratio is highly related to the elevation angle and frequency of operation (just like any terminated loop), and th
Hi George, Thanks for mentioning that antenna system thermal noise eventually establishes the limiting factor where additional preamp gain will not provide any additional improvement in performance.
Hi Rob, Front to back ratio all depends on the arrival angle of the signal, and the portable flag directional properties are just like full size flag directional properties assuming you select the ap
Hi George and gang, I really appreciate you as well as Steve WB6RSE making sure folks understand there are performance limitations when using very small antennas such as my portable flag as a dedicat
Hi Dave, I hate to recommend anything and others have given you some good recommendations, nevertheless I will make a few comments. My workhorse radio for direction finding is the good old Realistic
Hi John, You started this mess (or maybe I did), and finally here is my response to a few of the questions you had and thanks so much for waiting in line for my response. 1) As I have mentioned in a
Hi Tim, Thanks, and I have gain vs frequency plot on my website for the DX Engineering preamp and my measurements agree with yours. The DX Engineering preamp designed for use my my portable flag is d
Hi Jim, Its funny that you brought up this topic as yesterday when I was doing comparisons of the signal I could hear on my 160 meter vertical TX antenna versus my portable flag, I increased the aver
Hi Jim and gang, I would like to make one minor correction and then add some more info. On my SDR receiver I should have said I increased averaging from 1 to 10 in my previous post (not 2 to 10) and
Hi Rick, This next piece of info is not really related, but here is another data point for folks since you mentioned using an AM radio with built in bar antenna tuned to 1710 KHz to track down powerl
Hi JC, Thanks for posting all the great info. In my article I mentioned I normally use 20 dB of gain with my portable flag, but on 80 and 160 I sometimes use more gain. I just double checked, and sur
I said I'm glad I have the available extra gain that the DX Engineering preamp offers whereas most receivers would not benefit from it. I should have said that having the extra gain should not be det
Hi John, I think a tee is an excellent antenna for DX and as others have mentioned and thats what I would us but thought I should mention something regarding NVIS capabilities. I suspect a tee is dea
Hi Roger, I had a lot of fun early this morning working into Eu an hour before through a little past their sunrise. A lot of QSB but pretty decent signals and I even did a 2 way 100 watt QSO with F5P
I uploaded a short video of Luke (VK3HJ) who had a wonderful signal today just prior to my sunrise. This video was right after the QSO I had with Luke and I easily worked him with my 100 watts (thank
A couple of weeks ago there were a lot of postings about my portable flag for radio direction finding (for tracking down RFI), and someone asked about the DX Engineering preamp that was designed for
I should have said the so the 4.5 dB noise figure is certainly not unreasonable. Sorry for the typo. 73, Don (wd8dsb) _________________ Searchable Archives: http://www.contesting.com/_topband - Topba