On 10/9/2013 12:07 PM, peter chadwick wrote:
Manfred,
Chile would seem in practice to be not that much different to most other
countries!
<snip>
>Note that the FCC translation of SM329 into Part 97 managed to omit
>the 10 log P, so it's 43dB in the US.
Apparently this doesn't include IM3 as I think few amps, or even rigs
sold in the US have an IM3 as good as 43db or did I miss something.
I think QRO builders, "in general" have cleaner signals than the
commercial amps.
A note on ID in the US, on short transmissions, 3 minutes or less as on
many repeaters you normally hear the users ID only every 10 minutes.
Break-in CW is usually just BK with the ID every 10.
73,
Roger
One thing I do think that as amateurs we should do is to try to ensure that
home brew equipment
meets the relevant ITU standards on spurious emissions, although I grant
that for QRO at 10GHz on
CW, that's impossible. For HF, harmonics and spurs (unwanted sidebands
from a switching supply
perhaps?) should be 43dB + 10 log P dB down from PEP, without needing to
be more than 50dB down.
Note that the FCC translation of SM329 into Part 97 managed to omit the
10 log P, so it's 43dB
in the US. While amateurs are seen to be complying (i.e. not causing
trouble), we are more likely
to be left alone. Having said, that amateurs hadn't caused problems but
ITU TG1/3 revised SM329
in 1993 - 5 and brought amateurs in for the first time, anyway.
My rig uses a VFO, is very good on phase noise, rx and tx IMD and is 30 years
old.....so I don't
feel I'll change that!
73
Peter G3RZP
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