I have a horse farm behind me that has electric fences all over their smaller pens and larger pastures. When it is installed correctly and the sender is working correctly they are quiet. Unfortunatel
Nook wall chargers are also very bad. Jim - KR9U It turns out the the XYL was using a new (aftermarket) charger for her Galaxy Note 4 phone. This one was really bad. The label reads model SK01G-05001
If I find someone on 160 in zone 23 that uses JT65/9 can someone give me a reason we should not use 1000 watts? Jim - KR9U _________________ Topband Reflector Archives - http://www.contesting.com/_to
Here you can see the measured response of the filter in the commercial K9AY controller. http://www.wolfrfsystems.com/Specs.html Jim, KR9U ___________ _________________ Topband Reflector Archives - ht
However, if they have internet capabilities in P5, then can work themselves. Hi Paul, Think about an eventual P5 activation, a mega one, with lots of ops. The likelyhood that many of them will not ha
How long is the slope? A beverage or a BOG on a slope like that will work great. I don't know how it will work if the direction of interest is toward the top of the slope though. Any comments? Jim -
Trevor, I suspect you may be trying to detune the tower during receive, which I plan on doing here as well. Check your transceiver Amplifier Key Output line. That line should close about 10ms before
One can think of FT8 as a Pinball machine or a video game. You click "here" at the right time and maybe the ball falls just right and the other station comes back to you. If not, you click again. Pre
Does anyone know how to contact N5JA or if he is active? I am looking to get confirmation on a QSO from the mid 90's. An email address would be a big help. Jim Wolf, KR9U _________________ Topband Re
Interesting Arunas, 73, Jim - KR9U --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of ly2ij@qrz.lt Sent: Friday, December 7, 2018 6:39 AM To: topband@contesting.c
Stan, Without crunching through the numbers, it seems obvious that you will have to have a significant signal loss to overcome due to the low antenna gain at the input of a preamp. With -79 dB of gai
For a cheap and dirty 6 dB splitter, you can use a resistive splitter. https://www.highfrequencyelectronics.com/Dec10/HFE1210_Adams.pdf Jim - KR9U _________________ Searchable Archives: http://www.co
Why not just use your #73 core with 2 x 6 turns. It's close enough to 800 for receive. Jim - KR9U --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Richard (Rick
If the S-Meter is close to accurate, the signal on 160 meters is better than -30 dBm. One cannot dismiss that the noise floor of the transmitter on 160 meters is stronger than atmospheric noise and c
I think there is some misunderstanding of bandwidth using FT-8. A single FT8 "signal" occupies somewhere just a hair more than 50 Hz. However, that is not the number to use for calculating the equiva
Severe overload problems in the K9AY array from the transmitter will also cause overheating/burning up the 2 watt terminating resistors in the relay box at the antenna. I've seen arrays that are only
Another solution is the Mini-Circuits Transceiver protection device RLM-33-2W+. Jim - KR9U --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Martin Kratoska Sent
Pete, Sent you a direct response. James Wolf, KR9U Wolf RF Systems kr9u@wolfrfsystems.com www.wolfrfsystems.com Jim That says it all - Wolf doesn't seem to be answering e-mails and I figured someo
Pete, The K9AY will basically work provided it has an adequate ground system. It does need a good ground as that is the other half of the antenna, so adding 8 radials under it should help if that is
You can check the electrical operation of the relays on my page here in the FAQ. http://wolfrfsystems.com/ Mark makes a good point. A loop that is too close to the transmitting antenna can absorb eno