So if the transmit offset for a CB radio was overcome, and converting from AM to FM for a CB radio was overcome, adding CTCSS is a simple issue that will be easily overcome.
The problem with your idea of "I'd just rather shut the repeater down during band openings" is that plan just never seems to work. Guys are good about doing it for a while, then the persistance fades away (I've seen that MANY times) ------ Original Message ------ Received: Sun, 23 Dec 2007 07:35:36 PM CST From: "Paul Plack" <[EMAIL PROTECTED]> > The old HyGain AM/CB to FM/10m conversions were a snap to set up for 100 kHz offsets - a switch and a second TX offset crystal, or a diode-matrix or EPROM which subtracted "10" from the divider chain instruction when PTT went low. My SMC (a British CB that came already converted for 10 FM use) uses the former hi-lo power level switch next to the display for selecting simplex/offset, accomplished using an add-on chip to interpret for the channel switch based on PTT line sense. > > It's amazing what 3 or 4 watts mobile and a 4-foot loaded whip will do with a good repeater on 10m. (Even more amazing when you have to run simplex in a densely wooded area.) > > The issue with the CTCSS is not so much how to hook it up, but getting low frequency audio tones to behave in a PLL circuit not designed to handle them. > > I'd just rather shut the repeater down during band openings, or perhaps program the controller to switch to carrier access at night, than require tone full-time. Then again...maybe nobody's homebrewing or converting AM stuff anymore... > > 73, > Paul, AE4KR > > ----- Original Message ----- > From: JOHN MACKEY > To: [email protected] > Sent: Sunday, December 23, 2007 12:09 PM > Subject: Re: [Repeater-Builder] Re: 10 meter desense help, split site, high noise floor. > > > Comm-spec even gives instructions on how to make CTCSS work on AM CB radios! > > Really, 10 FM radios are so plentiful, that uncertainty regarding how well a > converted CB would work with CTCSS is not practical. Besides, I'll bet the > bigger technical challenge would be to get a converted CB to do 100KHz > offsets. > > ------ Original Message ------ > Received: Sun, 23 Dec 2007 05:49:45 AM CST > From: "Paul Plack" <[EMAIL PROTECTED]> > To: <[email protected]> > Subject: Re: [Repeater-Builder] Re: 10 meter desense help, split site, high > noise floor. > > > John, I think CTCSS should remain voluntary. I'm not sure how well it would > work with my CB conversion. > > > > I'd love, though, to get rid of "remote bases" on distant UHF and VHF > repeaters indiscriminately spilling local chatter out on 10 FM during band > openings. Nothing like having your contact with DX interrupted by two old guys > from Boston talking about a colonoscopy on their local 222 MHz machine. > > > > Or trying to monitor 29.6 when its covered in heterodynes from hams who > don't even own 10m rigs! > > > > 73, > > Paul, AE4KR > > > > ----- Original Message ----- > > From: JOHN MACKEY > > To: [email protected] > > Sent: Sunday, December 23, 2007 12:48 AM > > Subject: Re: [Repeater-Builder] Re: 10 meter desense help, split site, > high noise floor. > > > > > > It would be nice if we could also work in to the rulemaking a requirement > for > > 10 meter repeaters to be CTCSS or digital access for every transmission. > > > > ------ Original Message ------ > > Received: Sat, 22 Dec 2007 11:45:13 PM CST > > From: [EMAIL PROTECTED] > > To: [email protected] > > Subject: Re: [Repeater-Builder] Re: 10 meter desense help, split site, > high > > noise floor. > > > > > At 12/22/2007 20:40, you wrote: > > > > > > >It's been tried many times since the 1970's..... > > > > > > > >LJ > > > > > > The Commission has been a lot more flexible lately, so a petition for > > > rulemaking that asks for more 10 meter repeater spectrum may be a > > > worthwhile effort now. IMO, in order to have a reasonable chance of > > > success any such petition needs to clearly demonstrate that the > expansion > > > would have minimal impact on other non-repeater 10 meter activities. > > > > > > Bob NO6B > > > > > > > > > > > > > > > > > >
