Tuesday, December 31, 2002, G4WGT wrote:
G> The ERP stated here seems very high in respect of my limited experience with
G> LF power levels & antenna efficiency limitations. If these levels are
G> correct I will be interested to know how they are being achieved & what
G> restrictions are imposed by the licencing authorities in that area.
In Russia there are following limitations on 136 kHz:
29 jun 1998 radio amateurs of Russia have permission for
135.7-137.8 kHz A1A with power (Output - not ERP!):
100w 1 kategory
50w 2/3 kat
10w 4 kat
I.e. not CEPT's limitations in pwr
I use Big Vertical (see attach) on high (135m) tower
H effective ~90m
As fairly has noticed Dave G3YXM (RadCom July 2002):
"These restrictions mean that only those who have access to really
efficient aerials (like Ed's) are going to be heard in the UK"
I remind, that distance up to England from mine QTH abt 3000km!
I believe that such restrictions detain development 136 in Russia.
I use 100w TX and it allows me to achieve abt 20w ERP.
But at me is 3? thermo-current-meter in ANT and I usually support a current
in the aerial < 3A i.e. abt 10w ERP at ~40w Output
My LF-correspondents are in the best conditions on reception than I ;-))
Seldom at whom from them is even 1w ERP ;-((
In 2002 I have made 5 weekends LF-activites and I have abt 40 QSOs with
11 countries DXCC (136/136 QRSS and CW)
73! Ed RU6LA [email protected]