FB Howard. I checked the Redbook myself and it says "mean power", not peak power. From page 5.1.5:
Power is designated as: peak envelope power (PX or pX) mean power (PY or pY) carrier power (PZ or pZ) And paragraph 5.2.2.2 says: ".for transmitters with mean power less than 5 kilowatts, at least 43+10 log (pY) decibels." Note "pY" not "pX". If the Air Force wants to set up a separate rule apart from the NTIA standards, all you have to do is run 50 watts PEP and you're in since 43+10log(PX) = 60 dB when PX = 50 watts. It's unlikely anyone would be able to tell the 3 dB (1/2 S-unit) difference in your signal strength. . Indeed, the K3 might make the 63 dB requirement @ 100 watts PEP. Elecraft's spec is *greater* than 50 dB. I suggest dropping a note to <mailto:[email protected]> [email protected] or to <mailto:[email protected]> [email protected] and ask. My involvement with the K3 project is to help Wayne with the assembly manuals, so I'm not privy to many of the development details and plans. However, I am a licensed GMDSS maintainer so I'm obliged to have at least a nodding acquaintance with the rules that seem to crop up like dandelions in a meadow. 73, Ron AC7AC From: [email protected] [mailto:[email protected]] Sent: Saturday, April 18, 2009 2:50 PM To: Ron D'Eau Claire Cc: [email protected] Subject: Re: [Elecraft] Is Elecraft K3 NTIA compliant? Thanks Ron, The Airforce seems to interpret the redbook a little differently than you do. https://ntc.cap.af.mil/comm/equipment/NTIA_Standards.cfm They seem to say it is 43+10log(Peak Envelope Power), thus requiring 63db at 100 watts PEP. However, 50db+ is pretty good - puts it in the Kenwood TS-2000 and ICOM 7000 class which both have 0.5PPM and 50dB. Though not NTIA compliant. https://ntc.cap.af.mil/comm/equipment/hf_Detail.cfm?rec_id=126 https://ntc.cap.af.mil/comm/equipment/hf_Detail.cfm?rec_id=180 My 746pro is .5 ppm and 40db. https://ntc.cap.af.mil/comm/equipment/hf_Detail.cfm?rec_id=137 The Icom 7800 has .1 PPM and 55dB - also not NTIA compliant but very close https://ntc.cap.af.mil/comm/equipment/hf_Detail.cfm?rec_id=175 The Elecraft K3 isn't listed at the web site - not yet. Well, the K3 at 50db is getting close - perhaps while I save up my dollar bills - the design might improve? However there are under 5000 MARS members - not that many to cater to - and most are retired military. Howard N3ZH ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
