My apologies if my reply came over as hostile, I'm used to having to defend VHF as something more than former CBers on repeaters. I'm not familiar with the European rules, but from what I have dug up it looks like narrow FM is 20K0F3E emission above 10 meters. Most NBFM radios look to be set up for a maximum 5KHz deviation for roughly 15KHz bandwidth. Using a deviation meter I just measured a 2.6KHz deviation from the Flex-3000 on 51.500MHz using the built-in two tone test. I'm wondering if it will be possible to fatten the deviation to at least 4KHz, which is what I consider adequate for high quality FM QSOs, and on par with $150 mobile rigs.
On Sun, Feb 14, 2010 at 7:17 PM, Bob McGwier <rwmcgw...@gmail.com> wrote: > That was not my question. as a VHF/UHF operator I am aware. I asked if it > was legal to be wider than nbfm. > > The principal difficulty with our FM system is the lack of any pre-emphasis > and deemphasis (audio shaping). At the request of several people, > specifically some in Europe, we narrowed the deviation to make the radio and > software legal. Thus my question. It was a serious one, not flippant. > > Bob > > Sent from my Verizon Wireless BlackBerry > ------------------------------ > *From: * David McKenzie <k1...@vhfwiki.com> > *Date: *Sun, 14 Feb 2010 18:57:03 -0500 > *To: *<rwmcgw...@gmail.com> > *Cc: *<flexradio-boun...@flex-radio.biz>; flexradio Reflector< > flexradio@flex-radio.biz> > *Subject: *Re: [Flexradio] Will Flex-1500 have wide FM? > > Bob, > > Apparently you are of the opinion that VHF activity is limited to sideband > and FM repeaters. There is plenty of 2 meter simplex action in New England, > both horizontally and vertically polarized. There is also a good deal of 6 > meter FM during openings for when you are sick of the '59 goodbye' contacts. > In its current form, I don't believe the deviation is wide enough to sound > full on a decent 2 meter rig. One thing is for sure, the FM transmit quality > between my IC-271 and the Flex is astounding. If "proper shaping of the > audio" fixes this, I'll be a happy camper. > > 73's > Dave K1FSY > > On Sun, Feb 14, 2010 at 6:36 PM, Bob McGwier <rwmcgw...@gmail.com> wrote: > >> What is legal besides NBFM? We are adding full FM repeater support >> including tones, proper shaping of the audio (which is what I think you mean >> instead of what you said). >> >> this is for everything but is precipitated by v/u. >> >> Bob >> >> ------Original Message------ >> From: David McKenzie >> Sender: flexradio-boun...@flex-radio.biz >> To: flexradio Reflector >> Subject: [Flexradio] Will Flex-1500 have wide FM? >> Sent: Feb 14, 2010 5:51 PM >> >> I ragchew on 2 meter simplex FM and have a transverter that can do it, but >> since my flex-3000 only does narrow FM, it sounds like crap on transmit. >> Is >> the 1500 going to support reasonable FM performance? >> _______________________________________________ >> FlexRadio Systems Mailing List >> FlexRadio@flex-radio.biz >> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >> Knowledge Base: http://kc.flex-radio.com/ Homepage: >> http://www.flex-radio.com/ >> >> >> Sent from my Verizon Wireless BlackBerry > > > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
