Re: [Repeater-Builder] Hamtronics exciter

[Steve Grantham]

Well...  Does anyone think it would be feasible or practical to modify the TA-51 to implement an LC phase modulator?  Just how easy or how difficult might that be?   Steve ----- Original Message ----- From: Kevin Custer To: Repeater-Builder@yahoogroups.com Sent: Tuesday, April 13, 2004 9:46 PM Subject: Re: [Repeater-Builder] Hamtronics exciter [EMAIL PROTECTED] wrote: Hi Kevin,   Virgil mentioned that he had looked at the manual and noted that the TA-51 uses RC phase modulation. A-ha! The light went on. You can only get 90 degrees of phase shift max with an RC circuit. Had they used an LC phase modulator, they would have gotten 180 degrees max. That's why the deviation is low with that unit. They don't have much deviation to start with, and as you say, if it isn't multiplied a lot, it'll be low at the final freq. Tell Virgil thanks for the investigation.  Also as a side note from practical experience with this type of exciter, and as you have mentioned before as well, the tuning of the first stages after the oscillator are critical for good modulation, otherwise it will be very distorted. Kevin Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/   To unsubscribe from this group, send an email to: [EMAIL PROTECTED]   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.