Testo


venerdì 26 gennaio 2024

Why QRP is a real possibility

 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



martedì 12 dicembre 2023

QRP and QRPp QSO during ARRL Contest on 10m

 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

 



giovedì 24 agosto 2023

J-POLE FOR 145 MHz

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.



 73 de IZ3AYQ 



 

domenica 23 luglio 2023

J-POLE ANTENNA FOR 145,5 MHz

An antenna to use with a portable rig for 145 MHz, FM. The antenna is detachable in two pieces, the longest being 1 metre.

An easy to build portable antenna for the holidays, at the sea or on the mountains.

The antenna is constructed from two simple 1-metre aluminium bars, cut according to the measurements shown. The bars are fixed to a wooden support (if plastic is used, this is even better) with screws. Electrical contacts are made by means of holes in the bars and screws. There are additional free holes so that the electrical contacts can be moved and the resonance of the antenna can be calibrated.





73 de IZ3AYQ 



mercoledì 14 giugno 2023

1 watt QSO

In circa 2 anni, effettuati più di 500 QSO CW con 1 solo watt; collegati 58 entities, 18 fields e 202 grid squares. Collegati: nord America, Europa, Africa ed Asia. Rig: FT-818; Ant: Shorty Multy (off center feed dipole, caricato linearmente, su balcone).

73 de IZ3AYQ Fabio 





martedì 13 giugno 2023

QRP calling on 20 m

 Here is an example of morning propagation in june on 20 m, using 5 watt and Shorty Multy antenna with 4:1 UN-UN and no antenna tuner.

 

73 de IZ3AYQ Fabio 

 


sabato 8 gennaio 2022

A new Rig to build, the Micro-20

Here is a new rig to build, derived from Micro80 ( by RX3G, Oleg Borodin), and proposed by UY1IF, Alexey Martyntcov.

 
73 de IZ3AYQ, Fabio