Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: Simple image-cancelling exciter for digimodes

To: [email protected]
Subject: Re: LF: Simple image-cancelling exciter for digimodes
From: Rik Strobbe <[email protected]>
Date: Thu, 13 Jan 2005 18:58:54 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Internet Messaging Program (IMP) 3.2-cvs
Wolf,

an easy way to get the 25% signals would be to use a Johnson counter (eg. CD4017).

73, Rik  ON7YD

Citeren Wolf DL4YHF <[email protected]>:

Hello Alberto,

Thanks for the point - and Ok about the reversed Tayloe detector : In

fact, the circuit -as it is- is already quite similar. One difference
is the duty cycle of the switching waveforms (if one would use a fourfold analog switch like the HC4066) for the "Tayloe":
For Tayloe switches, it would be 1 /  4 (each switch conducts 25 % of

the whole cycle)
For the classic image cancelling mixer, the duty cycle is 1 / 2 (50 %

conduction in the cycle).
Unfortunately the simple quadrature L.O. with two flipflops cannot be

modified (without extra components) to produce the "Tayloe"-
switching waveforms.

Best greetings,
Wolf DL4YHF .







<Prev in Thread] Current Thread [Next in Thread>