37	2006-07-25 15:50:10	Pete Eaton	VFO Options
Message	Date	From	Subject
Several folks have mentioned the challenge in procuring variable capacitors and reduction drives that can tune the entire band while staying within budget. A PTO might be an option to consider. WA6OTP offers one possible solution: http://www.wa6otp.com/pto.htm Given it's 500 KHz tuning range one can easily cover the entire 40 meter band with no reduction drive needed. Adding a simple digital display like Wolf DL4YHF's single PIC Freq Counter offers one possible solution: http://www.qsl.net/dl4yhf/freq_counter/freq_counter.html While I have no experience with PTO's several manufactures used them successfully for many years with excellent results. On the other hand if someone can design a $5.00 DDS/PLL VFO with no spurs....... Pete WB9FLW __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
39	2006-07-28 20:10:08	Stan	Re: VFO Options
Hi Pete, the WA6OTP PTO is a good circuit, One needs to do a little mechanical work to come up with a neat tuning method. It is easy to change the frequency to other values, standard LC calculations. Stan ak0b
41	2006-07-29 12:12:13	zx97lite	Re: VFO Options
Hi Stan, Found the following PTO mechanical design on the BITX20 Yahoo Group: http://f1.grp.yahoofs.com/v1/IKLLRKjPLkOj6mTRQ8EqfRFAG34jF5bdRISd9SbDbAedQ5iKIP1cx6Xr5MQrDcwWcZRTGhZgY_-Sqw5TOtDq6RqdIRxGnuU/K7HKL/PTO_Simplified_Mechanicals%28K7HKL%29.png On WA6OTP's design he claims 13 KHz per revoluti
42	2006-07-29 14:18:29	Roy J. Tellason	Re: VFO Options
On Saturday 29 July 2006 03:11 pm, zx97lite wrote: > Hi Stan, > > Found the following PTO mechanical design on the BITX20 Yahoo Group: > > http://f1.grp.yahoofs.com/v1/IKLLRKjPLkOj6mTRQ8EqfRFAG34jF5bdRISd9SbDbAedQ5 >iKIP1cx6Xr5MQrDcwWcZRTGhZgY_-Sqw5TOtDq6RqdIRxGnuU/K7HKL/PTO_Simplified_Mecha >nicals%28K7HKL%29.png The link doesn't work. Looks like one of those "dynamically generated" links that yahoo is so fond of using for stuff... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
43	2006-07-30 00:54:28	Stan	Re: VFO Options Now : BITX project comments

44	2006-07-30 10:24:52	zx97lite	Re: VFO Options
Hi Roy, Sorry for the confusion. Go to the BITX20 Yahoo Group. Under BITX20 Files there is a "K7HKL BITX Tools" Directory, there you will find: "PTO_Simplified_Mechanicals(K7HKL).png" Let me know if you have any problems. Best Wishes, Pete WB9FLW
45	2006-07-30 11:00:26	Roy J. Tellason	Re: VFO Options

49	2006-07-31 18:07:46	Roy J. Tellason	Re: VFO Options
On Sunday 30 July 2006 01:51 pm, Roy J. Tellason wrote: > On Sunday 30 July 2006 01:21 pm, zx97lite wrote: > > Hi Roy, > > > > Sorry for the confusion. > > > > Go to the BITX20 Yahoo Group. > > > > Under BITX20 Files there is a "K7HKL BITX Tools" Directory, there you > > will find: > > > > "PTO_Simplified_Mechanicals(K7HKL).png" > > > > Let me know if you have any problems. > > > > Best Wishes, > > > > Pete WB9FLW > > I'm apparently "pending" for now... Got it, and thanks. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin