Woah, wait. Toggle switches to replace the relays???!!!! So how do you propose that would work… do a binary search towards a low SWR solution? That reminds me of loading the operating system into an ATARI 8080 system using front panel switches… could take forever and a few days. If you are worried about current draw, go with latching relays. Back in March, I bought several hundred latching relays for $0.89 each… yes they can be had cheap if you buy them right from the source.
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From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Arv Evans
Sent: Friday, August 24, 2018 8:18 PM
Subject: Re: [QRPLabs] QSX radio feature requests
The K3NG ATU is an interesting design but uses several relays. That is fine for automation
purposes, but I wonder if the design could be reproduced with a handful of DPDT rocker or
toggle switches replacing the relays. Maybe there needs to be 2 versions of this well thought
out design, one that is automated and another that is manual for low current draw and increased
battery life for portable use.
On Fri, Aug 24, 2018 at 6:27 PM Glenn <glennp@...> wrote:
The K3NG ATU lends itself to home brew. And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.