Testing the Rooster for 20 meters. I used this small CW Rig with a vertical end fed of 10 m, on a fishing rod, balun 64:1, and a manual antenna tuner. The power is 1 watt or less; the frequency is almost fixed, going from about 14059.5 to 14059.9 kHz.
I three days, i had QSO with: EB5F (1322 km), EA2BJ (1195 km), OH2EUZ (1859 km), G3YPZ (1181 km).
73 de IZ3AYQ Fabio
It is possible to change the frequency with a trimmer on the board.
Most of the components are SMD; they are already soldered; only about 20 traditional components must be soldered in the kit. So, it is an easy kit.
73 e 72 de IZ3AYQ Fabio
Testing the kit Rooster for 20 m; 1 watt or less, frequency 14060.5 +/- 0.5 kHz; CW. 73 and 72 de IZ3AYQ Fabio
Many Thanks to Bert, PA1B, who made the figure more readable! Bert is a QRP and QRPp enthusiast, experimenting with very low power transmissions, even with 3.6 milliwatts.
This is the link to his interesting blog: Blog
(you can find QRP and QRPp activity, attenuators, his Monster Can antennas, and more).
Use of the figure.
In this figure you can see that if you use 1.000 W and your signal is 9+40 dB, if you use (under the same conditions) 1 watt, then your signal is 9+10 dB; so, if the QRM is under 9+20 dB, the QSO is possible.
If you use 100 watt, and your signal is 9+20dB, then, with 1 watt the signal is 9, with 5 watt the signal is 9+7dB, and with 100 mW the signal is 7+2dB.
If you use 100 watt, and your signal is 9, with 1 watt the signal is 5+4dB. Again, if the QRM is under 5+5dB, you can make QSO also with only 1 watt.
QRP is a real possibility. In this picture you can see that if you use 1.000 W and your signal is 9+40 dB, if you use (under the same conditions) 1 watt, then your signal is 9+10 dB; so, if the QRM is under 9+20 dB, the QSO is possible.
If you use 100 watt, and your signal is 9+20dB, then, with 1 watt the signal is 9, with 5 watt the signal is 9+7dB, and with 100 mW the signal is 7+2dB.
If you use 100 watt, and your signal is 9, with 1 watt the signal is 5+4dB. Again, if the QRM is under 5+5dB, you can make QSO also with only 1 watt.
73 de IZ3AYQ
On Saturday 9 and Sunday 10 I am participating a couple of hours in the ARRL contest in 28 MHz CW. I use my FT-818, with vertical, 10 m End fed antenna on fishing pole.
I decide to use 1 watt, given the open propagation. I immediately connect: RK4FD (2485 km, Penza), UA4CC (2561 km, Saratov), R8TT (3004 km, Orenburg). I lower the power using an attenuator, and using 500 milliwatts, I connect: RM9I (Tomsk, Asian Russia, 4967 km), UA4W (Izhevsk), UC9A (Chelyabinsk, Asian Russia, 3555 km). Given the good propagation and low QRM in band, I lower the power again to 100mW, hoping to get lucky. I call RM9I, already connected with 500mW, and he also listens to me with 100mW, but he says, sorry! already connected, and he is right, so he does not give me the RST report.
I try again with 100mW, and there it is: RD4A (Volgograd, 2444 km), RX9WN (Ufa, 3210 km), UC4P, R4GM ( Kuznetsk, 2594 km).
Best Dx: RM9I, WITH 0.5 W, and 4967 km;
Best Link: RX9WN, with 0.1 W, 3210 km, equaling 32100 km per W.
73 de IZ3AYQ Fabio
The j-pole attached to the sun umbrella in Caorle, Adriatic sea. Qso done with Rimini, about 160 km, Monfestino, about 200 km, and Trieste. Power used: 3 watt.
