Hi Olof Your signal was very good during the weekend contest 569 solid working Europe, I called you several times one hour before your sunrise,. Yesterday I heard you again on 160m with QSB and very
Hi topband lovers Comments and an heads-up to watch for openings SSE/SSW on 160, 80, and 40m. This DX season is starting somehow different from last ones. Two weeks ago a heard BD7PUZ 569 for 15 minu
Hi topband lovers Comments and an heads-up to watch for openings SSE/SSW on 160, 80, and 40m. This DX season is starting somehow different from last ones. Two weeks ago a heard BD7PUZ 569 for 15 minu
Hi Mike and Don The DHDL as well as few other antennas, has a hidden component. The bottom wire parallel to the ground is a transmission line, actually, any antenna parallel to the ground is a transm
Hi Nick The wire will reduce loss on the transmission line given a better match and phase. In practice you can see change on the SWR and front back. If you have a good ground you probably won't see a
Hi Nick I would say grounded both ends, don't need to be connected to the antenna itself, right. JC --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Nick Hall-P
Hi Mark Terminated loops are very old, the first patent belongs to Harold Beverage Harold Beverage invented wide band receiver antenna, loaded loop in 1941 https://docs.google.com/viewer?url=patentim
Sorry, the invention was in 1938 and the patent issued 1941 Hi Mark Terminated loops are very old, the first patent belongs to Harold Beverage Harold Beverage invented wide band receiver antenna, loa
Hi Guy I live in Ft Lauderdale city lot, 6 million people in 100 miles, very noise on the vertical, zero noise on the Horizontal Waller Flag, In the next 10 year every ham will use some kind or recei
Hi Bruce "We know that limiting the noise pick up from more directions of an antenna we can usually hear better" Agree, actually the directivity of the receiving antenna is the only place you can inc
DONT OPEN THE LINK IT NOT FROM ME. IT MAY BE A VIRUS!!!!! "Re: Topband: Radio World; Noise Floor; Where do we go from here?" JC doc <http://www.duncantoys.co.za/46125190RA4fKF9i9yRKb8rha3y7fQTZsn8zQT
Nowadays we have a huge amount of RF repeaters in use for several services, like , Wi-Fi , LTE4, Data links. Microwave links, FM stations link, TV video links. All these systems has a receiver and a
<< True grey line radio wave propagation rarely occurs on 160 meters and true long path propagation even less. When it does the opening is usually only a few minutes long. Instead it's usually a skew
The problem with doorknobs capacitor is the dielectric. Class one or NPO does not change capacitance with temperature and has low loss on 1.8 MHz, however the max capacitance you can find is 170pF. M
BD0AAI is zone 23 and likes JT modes and cw. JC N4IS 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 _________________ Topba
Hi topband lovers, The basic concept that explains how power and signal to noise ratio works on low band is very simple. On high bands we need the signal to bounce back to the Earth. Without ionizati
Hi Bruce V P 8 A L J beacon transmits with 30w and the antenna is a vertical but I don't have more information about it. The frequency is 1804.8, I can hear the beacon here in Florida 449 to 559 almo
Hi Piotr Yes, the WF load the tower and if you use the same tower to transmits, like I do, the voltage can me over 10KV. Also the transformer and resistor should stand 900 joules or 1 KW for one seco
I've worked 20 new countries on 160m this winter alone on bands that are closed are so polluted with RF noise, that it would not be possible with the human ear. <<< I kindly can't agree with that. Y
Kevin There is a well known DLW Associates AM Broadcast Band Brick-Wall High Pass Filters http://dlwc.com/ The 9 pole filter can be tuned for one of the deep nulls attenuate the station you need by 7