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Call Sign : 163-CT-220...MW7TTA Posts : 1937 Times Thanked : 47 Join date : 2019-11-19 QTH or Location : Anglesey North Wales Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+. Age : 149
Subject: Re: RSGB EMF compliance Sun Dec 12, 2021 9:16 am
Morning Victor. I gave up researching the ft4/8 as so many contradictions on many posts. Just make your own mind up and stick to that lol 50% or 100%. But how can it be 100% when it's 50/50 lol. Chicken or egg.
Call Sign : 26-CT-3228 Ham M7VIC Posts : 4030 Times Thanked : 253 Join date : 2019-11-10 QTH or Location : Bedford Equipment Used : Various
Subject: Re: RSGB EMF compliance Sun Dec 12, 2021 9:32 am
There's loads going on to cloud the issues but in all reality you can either be transmitting or not. (Felt like flipping Yoda then! )
The EMC compliance concerns our actual transmissions not the gaps between. It all gets complicated with phone modes such as Sideband or even AM and I think they've done a splendid job at allowing a percentile rather than a peak measurement. But FT8 still is a 12.6 second full on transmission and you only have to look at our power meters to see that.
If we argued that our Foundation 10W limit could be increased somehow due to the 'duty cycle' of transmission there'd soon be complaints!!!
G0RQQ, Alan Pilot and Chickenfoot@1987 like this post
Call Sign : 26CT866 Posts : 54 Times Thanked : 1 Join date : 2019-08-23 QTH or Location : Lincoln Equipment Used : CRT2000 on CB, FT-920 on amateur bands; end-fed wire 20m long
Subject: Re: RSGB EMF compliance Sun Dec 12, 2021 11:30 am
I’ll have to recheck some of the numbers for my FT4/8 transmissions as I was borderline compliant on a couple of bands. Unfortunately because of where I live I can’t reorientate my antenna so a slight power reduction might be needed.
As I mentioned before, I cannot change my antenna as it has to be a “stealth” installation. So what I did was work backwards from ICNIRP compliance to what would be the maximum power I can use.
I was pleasantly surprised to find that I can run enough RF from my station to meet my objectives. OK, it’s not a kilowatt or even 100 watts but it’s enough enable me to have respectable global contacts.
I’m quite happy to accept the limitations secure in the knowledge that my station is operating safely.
Really impressed that you have found a way to abide by not only regulations we found imposed on us but also taken on the personal responsibilities associated. More pleased that you have discovered you can still operate your station effectively even under what many coined as 'restrictive' terms.
It's all to easy to use crank up the watts with complete disregard for others and often quite pointless if you can transmit further than you can ever receive. Even a 'pileup' can be effectively worked with better operating methods rather than bullying your way in with power usage.
Got to say, I'm happy for you and tip my hat in recognition of your true Radio Amateur spirit.
Thanks for posting your findings, it's sure to help others.
All the very best, Victor
(Had to give you a 'Thanks' vote too Keith, most impressed.)
I found that on most HF bands I can use powers in the region of 25 watts and still be ICNIRP compliant. At 25 watts I am 6dB or 1 S-point down on 100 watts. So what if I’m S8 instead of S9? An S8 signal is still enough for a good solid QSO!
That’s similar to what I discovered when doing the calculations for 10m FM with my end-fed wire. I just elected to do the calculations based on 2 minutes talk-time in every 6 minutes on the basis that 10m FM contacts tend to be brief in nature - then everything fit!
I'm good 100watts max to the cobweb at 7metres. No one can get near it in my garden or the three gardens that join mine.
The Hustler will just be ok on 20/17/15 and 10 although I don't use it for those bands.
The Create log periodic for all bands 50megs to 23cms is ok, it's way above our roof the nearest building is next doors dormer with a bit to spare. I'm safe with 100watts 2m, 50watts on 6 and 4m, 75watts on 70cms and 10watts on 23cms.