Topband: ADC overload from MW transmitters

G’day For those topbanders, who have medium wave stations nearby and are thinking about trying a DDC/DUC SDR, you may find the comments below from Phil VK6APH/VK6PH (in answer to a query on the Apache Labs reflector a few years ago) of interest. Phil lives line of sight from the Australian

Re: Topband: ADC overload from MW transmitters

On Sun,10/18/2015 8:59 PM, Steve Ireland wrote: Phil lives line of sight from the Australian Broadcasting Transmitter installation in the northern suburbs of Perth. There are three AM transmitters there which run 24 hours a day, seven days a week: 6PB at 10 kW on 585 kHz; 6RN at 20 kW on 810

Topband: Tee Antenna dimensioning

A NEC4.2 model of a tee using a 60-ft tall vertical conductor shows 29 -j 0.04 ohms at 1.9 MHz when connected at the top to the center of a horizontal conductor 89 feet in length. The tee was base-driven against 16 x 33-foot radials buried 4 inches in 5 mS/m, d.c. 13 earth. Conductor ODs are

Re: Topband: Topband Digest, Vol 154, Issue 18

Hi Peter, I have built many 160 T’s and they always come out best with the vertical height + the horizontal top equaling around 135 – 140 ft for 1820. I know you mentioned 1900 but you can scale that from these numbers. I have several with 90 ft vertical and 45 top wire and friends with 70

Re: Topband: Pre Stew - N3A

Thanks to everyone for all the Q's and patience digging my QRP signal out. I made 103 contacts with many 6 & 9 point contacts and four 12 and 15 point contacts. Those were a real challenge. Overall band conditions were great with low QRN and local noise. I had a blast ! -73 Joe N3A/N3HEE

Topband: Tee Antenna dimensioning

Advise please on the formula to calculate the lengths of the horizontal elements for a 160m Tee antenna. Currently I have a 60 foot vertical wire suspended between the trees, with a long horizontal section making an inverted L, but want to change it to a Tee. I am looking to resonate the antenna

Topband: BOG antenna research at HC1PF

  Luis, IV3PRK/HC1PF  has been instrumental in BOG antenna research. He has brought together information from some of the top BOG antenna users/researchers, and an antenna plotting expert. He has constructed BOG antennas that helped over come noise at HC1PF his 2nd QTH near the equator.   

Re: Topband: Tee Antenna dimensioning

I used the "tantenna.exe" calculator program which I downloaded from this page and found the dimensions it calculated for my 160M T to be very close to reality over my soil and about 32 random radials. The program was written by the late Reg Edwards, G4FGQ.

Re: Topband: BOG antenna research at HC1PF

Luis's BOG page is very informative. Last night's contest was the first time I have used directional receiving antennas (in this case BOGs) during a contest on TB. Art NK8X ᐧ On Sun, Oct 18, 2015 at 11:47 AM, K1FZ-Bruce wrote: > > Luis, IV3PRK/HC1PF has been