My reaction to "phone" exactly, since a typical "AM Phone" signal will occupy 6 of the 7 kHz!
Back in the days when shipping used these frequencies, only Morse was allowed for routine communications although modulation was applied to produce MCW for emergencies. That was a carryover from the days when some ships still used crystal detectors for emergency comms. Un-modulated CW produces no tone and at best soft clicks in a crystal receiver. But in those situations everyone had to QRT around the frequency of the emergency signal (usually 500 kHz) so sidebands were of no concern. It is true that a little bit CAN go a long way. Back in the 1990s when I was working on ships with MF CW gear I had the opportunity to share coffee with a radio operator and his captain who had spent hours circling in the Pacific looking for the source of an SOS on 500 kHz. It turned out to be a hand-cranked lifeboat transmitter in the Med.! They were chasing a phantom signal at the antinode half way around the world. The emergency transmitter ran a couple of watts at best into a very limited antenna hung by a kite or balloon over the raft. 73, Ron AC7AC -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Edward R Cole Sent: Friday, September 15, 2017 7:17 PM To: Elecraft Reflector Subject: Re: [Elecraft] 630 meter band open for use Bill, I could not believe it when you stated all modes allowed, so I checked the CFR47, 90.307 https://ecfr.io/Title-47/se47.5.97_1305 630m allows RTTY, data (see 97.307 (3) 630m phone and image (see 97.307 (1)(2) But seriously no 3-KHz phone should be used since one QSO would occupy nearly 50% of the 7-KHz wide band. I'm astonished that the FCC permits phone on 630m. CW and digital is most efficient use of spectrum and weak signals. 97.313 https://www.ecfr.gov/cgi-bin/text-idx?SID=2689706e634fb3e73b9f4ef814c352e9&m c=true&node=se47.5.97_1313&rgn=div8 (l) No station may transmit in the 472-479 kHz (630 m) band with a transmitter power exceeding 500 W PEP or a radiated power exceeding 5 W EIRP, except that in Alaska, stations located within 800 kilometers of the Russian Federation may not transmit with a radiated power exceeding 1 W EIRP. So this observes that 630m transmitting antenna are expected to be very inefficient 500w resulting in < 5w erp. My inverted-L calculates to be 3w erp with 100w. So Mel +20 dBm (100mw) will result in about 3mw erp using my antenna. Of course you may put up a full size vertical 521 foot high (with 521 foot ground plane) or a 1142 foot dipole only 1000-foot high. Most of us will use antenna under 10% full size with resulting dismal efficiency. But 5w erp can go a long distance on 630m; my signal was detected in Buffalo, NY (about 4,000 miles). 73, Ed - KL7UW, WD2XSH/45 (ARRL Experimental License) --------------- To: Bill Frantz <fra...@pwpconsult.com>, Subject: Re: [Elecraft] 630 meter band open for use Interesting in reading the FCC notice, ALL modes are allowed!!! ?So some enterprising company should make a transverter for us??????? ?It is only allowing 5W EIRP, a signal generator and do +20 dBm, Hummmmmmm. Mel, K6KBE From: Bill Frantz <fra...@pwpconsult.com> To: elecraft@mailman.qth.net Sent: Friday, September 15, 2017 4:02 PM Subject: Re: [Elecraft] 630 meter band open for use Just submitted my data for both bands. I got the lat/long from QRZ.com and checked it against the "Maidenhead" app on my cell phone. 73 Bill AE6JV 73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: dubus...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to r...@elecraft.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
