Here is a link to a very small broadband active receiving antenna. The entire antenna and associated source follower and emitter follower buffer amp will fit inside a 6" x 2" PVC pipe. Very clever and elegant design, and it works extremely well. I've built two of them, and this weekend will be hanging one of them from a PVC boom attached to the tower. In addition to being an exceptional broadband receive-only antenna, it also works very well as a noise-sense antenna in conjunction with the DX Engineering NCC-1 to eliminate periodic local powerline noise.
< http://www.radiopassioni.it/pdf/pa0rdt-Mini-Whip.PDF > Other useful information: < http://carconline.blogspot.com/2009/05/pa0rdt-active-antenna.html > 73, Dale WA8SRA On 8/3/2012 2:32 PM, N5GE wrote: > The diversity receive antenna (DRA) must be connected to the AUX antenna on > the > back of the K3. Unless your DRA has the same gain as the transmit antenna you > will need to use a Preamp on the DRA. > > I use a DRA that is a 38 inch diameter loop of aluminum tubing that I can > rotate > to peak up the signal of the far off station. That loop has a 35 dB LNA > attached. > > Most of us don't have the space to erect a large receive only, so we use > smaller > antennae for the DRA. If you are one who has the property to make a full size > DRA, then you can probably get by without a Preamp unless you locate the DRA > as > far away from the TX antenna as possible. The old ship to shore stations used > to locate the DRA and RX antennas miles from the transmitter, so since most of > us can't do that, here are some links to specialized RX antennas. > > http://www.pixelsatradio.com/product/shortwave-magnetic-loop-antenna/ > > http://www.dxengineering.com/search/department/antennas/brand/dx-engineering/part-type/hf-receive-antennas > > Don't let this discourage you. The antenna I use is the one from PixelSat > Radio, but you can make one just like it yourself if you like to build things. > > Amateur Radio Operator N5GE > ARRL Lifetime Member > QCWA Lifetime Member > > On Fri, 03 Aug 2012 10:16:18 -0700, Jim Bennett <[email protected]> wrote: > >> Still have issues with this. Here are the settings in Config that I'm >> assuming are relevant: >> >> L-Mix-R = A b >> SPKRS = 1 >> SPKR + Ph = no >> SQ Main = Sub Pot >> SQ Sub = Sub Pot >> Sub AF = Nor >> >> With these Config settings, the K3 works fine with the SubRX turned off; >> equal Main audio in both headphones. When I turn on the SubRX, it is still >> OK; I get Main audio in the left ear and Sub audio in the right ear. I know >> I'm getting the Sub audio in the right ear, as I can turn the sub VFO and >> hear the frequency change in my right ear. BUT, as soon as I turn on >> Diversity, I get almost no signal in the right ear. It isn't silent - it's >> just that the signal that is pounding in on the Main is nearly inaudible on >> the Sub. If the signal being received on the Main is less than S7, I can't >> even hear it on the Sub with Diversity turned on. If it is an S9 or greater >> signal, then I can just barely hear it on the Sub when Diversity is turned >> on. >> >> Very strange. The SubRX works fine until Diversity mode is enabled. >> >> Any ideas? Does this need to be escalated to Elecraft Tech Support? >> >> >> On Friday, Aug 3, 2012, at Friday, 6:02 AM, Mike K2MK wrote: >> >>> Hi Jim, >>> >>> One of the following might be helpful. >>> >>> If you have CONFIG:SPKRS set to 1 and CONFIG:SPKR+PH set to YES it will turn >>> off the right channel of your headphones. Avoid the problem by turning >>> CONFIG:SPKR+PH to no when using diversity. >>> >>> You also need to consider the setting of two other parameters which can be >>> confusing with respect to SUB RX use. The first is CONFIG:SUB AF. Depending >>> on whether you have chosen BALANCE or NOR it changes the way the concentric >>> audio control operates. The second is CONFIG:L-MIX-R which controls which >>> receiver's audio is in which ear. This control gets overridden when >>> diversity is used and reverts to MAIN in left ear and SUB in right ear. So >>> you might have one arrangement set for general SUB RX use and when you go to >>> diversity it changes. >>> >>> 73, >>> Mike K2MK >>> >>> >>> >>> Jim Bennett wrote >>>> I just recently added the sub receiver to my K3. I've been using the Sub >>>> receiver (without diversity turned on) and all was fine. I have the Yamaha >>>> CM500 headset - one cable plugged into the Phones jack and the other going >>>> to the Mic jack. I also have an Icom SP-20 external speaker, and it's >>>> connected to the Spkrs jack. >>>> >>>> Well, I engaged Diversity mode and at first thought it was working >>>> properly. But, when I turned the AF to zero on the Main receiver, I >>>> realized that the audio on the Sub was almost nonexistent signals are >>>> there, but really, really weak. OK, so looking at the Config parameters, I >>>> noticed in the KRX3 manual that SPKRS should be set to 1. Mine was set to >>>> 2. I changed it to one and now have zero audio coming from the Sub >>>> receiver. Not exactly what I was hoping for. >>>> >>>> What do I need to do to get my headphone audio in Diversity mode to act as >>>> it does with the Sub turned on, but Diversity off? >>>> >>>> Confused, I am. >>>> >>>> Jim / W6JHB >>>> >>> >>> >>> >>> -- >>> View this message in context: >>> http://elecraft.365791.n2.nabble.com/K3-Phones-Diversity-Question-tp7560223p7560229.html >>> Sent from the Elecraft mailing list archive at Nabble.com. >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
