"Dennis Monticelli" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Hi Steve,
I dug out my schematic and it actually takes a few components. My recollection was only of the inductor. Basically you place a series LC circuit in the secondary of T2 to filter out the harmonics from the sawtooth before they reach the speaker. I first elected to lower the freq of the sidetone down to 750Hz because that was more to my preference. I simply placed 160pF across C8 to accomplish this. The series LC filter is then made resonant at 750Hz. I used a 31mH torriod in series with 1.33uF of capacitance (formed by a 1uF in parallel with 0.33uF). Other LC combinations of 750Hz resonance will work as long as you are mindful of the series R of the inductor, which determines the Q. If the inductor is too lossy, the tone won't be as pure. Correspondinly if the Q is quite high then then you may have to tweak either the oscillator or resonator capacitor to match up the resonance to the oscillator. I have probably made it sound harder than it really is. The mod worked first time for me using an inductor out of my junk box. I think the Q fell between 5 and 10. Dennis AE6C On 10/23/07, Steve Berg <[EMAIL PROTECTED]> wrote: > > Steve Berg <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > Hi Dennis, > > What is that one additional component, and where does it go? > > Steve WA9JML an otherwise happy TO keyer afficianado > > > Dennis Monticelli wrote: > > "Dennis Monticelli" <[EMAIL PROTECTED]> made an utterance to the drakelist > > gang > > ---------------------------------------------------------------------- > > I don't have a CMOS-4 so I cannot comment. I have a Tick keyer that > > just uses a single CMOS PIC controller and I find I can use it just > > fine pretending it is non-iambic. > > > > I agree with you regarding the memoryless TO keyer. It is > > unforgiving. On the plus side it will teach you to send better code > > :-) It comes out of the closet at my QTH only during the vintage > > contests. I did do a simple mod to turn the raspy sidetone into a > > nice sine wave. It only took one additional component. > > > > On 10/22/07, Doug Smith <[EMAIL PROTECTED]> wrote: > >> Doug Smith <[EMAIL PROTECTED]> made an utterance to the drakelist gang > >> ---------------------------------------------------------------------- > >> On Mon, 2007-10-22 at 23:36 -0400, Garey Barrell wrote: > >>> Personally I use the CMOS-4 from Idiom because it's one of the few > >>> that > >>> I can turn off that stupid iambic junk that will drive any bug user > >>> crazy! :-) > >> I didn't know that! I had to drag out the manual and check it out. > >> > >> I used to be able to send good code with my W9TO keyer but bought a new > >> Nye keyer in the mid-1980s along with a Bencher Iambic key. I never > >> learned how to use iambic mode and don't care about it. However, I did > >> become accustomed to the dot and dash memory and now I can hardly send > >> without it -- especially below 25 wpm or so.. So, the TO keyer is not > >> getting much use anymore. (But it looks *so* good with the Drake > >> 4-Line!) > >> > >> The Nye and the CMOS-4 both have dot / dash memory and the memory > >> function works even with a non-iambic key. > >> > >> With an iambic key connected to the CMOS-4, I don't find *any* mode that > >> is not iambic capable. What V mode are you using? Are you running V9 > >> with no dot/dash memory? > >> > >> And, more generally, what is the difference between Curtis, Accukeyer > >> and Logikey modes? I've tried the various modes now and other than dot > >> and dash memory options I don't see much difference. Man, I've been > >> pounding brass since '65 and I've got a lot to learn! > >> > >> 73, > >> -Doug, W7KF > >> > >> > >> > >> ---------------------------------------------------------------------- > >> Submissions: [EMAIL PROTECTED] > >> Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > >> Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > >> Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > >> ---------------------------------------------------------------------- > >> > > > > ---------------------------------------------------------------------- > > Submissions: [EMAIL PROTECTED] > > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > > ---------------------------------------------------------------------- > > > > > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
