[Premium-Rx] Almost premium Harris RF-550

[Peter Gottlieb]

Yes, that’s fairly standard for optical encoders but is a little tricky for mechanical ones because of contact bounce.  I really want the functionality of a pushbutton on that shaft but may have to give that up as I can’t find any miniature optical encoders with that feature that aren’t pretty expensive. High cost would discourage others from using my design. 


Peter

> On Dec 9, 2017, at 6:28 PM, danny.higgins <danny.higgins at keme.co.uk> wrote:
> 
> Hi Peter.
>  
> I did something similar with a PIC to control my RA3702 dual RX and associated drive unit. By connecting the encoder outputs to 2 interrupt driven I/O lines on the PIC I was able to get an up/down count from each edge of the encoder, giving 4 times the resolution of the basic encoder without any backlash. Each transition of the encoder outputs created an interrupt, and by looking at the state of both lines and also their previous state it was possible to determine which direction the encoder was rotating.
>  
> Regards,
> 
> Danny Higgins, G3XVR
>  
> From: Peter Gottlieb
> Sent: 09 December 2017 18:42
> To: premium-rx at mailman.qth.net
> Subject: Re: [Premium-Rx] Almost premium Harris RF-550
>  
> I'm just finishing up a bunch of small repair projects and plan on doing
> something similar for the PRC-104.  I'll put it up on GitHub once it starts
> taking shape.  I've been playing with different encoder "acceleration"
> thresholds.  I like encoders with at least 128 PPR but sealed small ones with
> pushbutton action are difficult to find.  The high PPR, combined with smaller
> tuning steps, gives a more analog feel.
>  
> Keith, the RF-550 is a pretty good performer and well built so I would say it's
> a premium receiver.
>  
> Peter
> kb2vtl
>  
>