[Amps] Regulations

[peter chadwick]

Roger,

The 43 dB applies at 2.5 times the necessary bandwidth away, or for SSB, at about 7.5kHz away from the centre of the transmission. I would like to send you the results of the measurements of SM5BSZ which show only one rig meeting the requirement....the FT1000D, but my ISP won't allow sending emails over 3Mb.

73

Peter G3RZP


========================================
 Message Received: Oct 09 2013, 06:17 PM
 From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
 To: amps at contesting.com
 Cc: 
 Subject: Re: [Amps] Regulations
 
 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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 > http://lists.contesting.com/mailman/listinfo/amps
 >
 
 
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