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Chris

Yes. The QSX has a green/yellow?transflective LCD. The backlight may be switched on or off under firmware control.?

73 Hans G0UPL

On Thu, Sep 20, 2018 at 8:44 PM Chris Smith <me@...> wrote:

Spot on.? Most of the absorption comes from outside the visible spectrum anyway so the point on colour is moot at least from a heating perspective.

From an interface and usability perspective, things are different though. The combination of the enclosure colour and the LCD type used are a major usability decision. The best outcome for a portable or home use device is a dark enclosure with a transflective LCD (green LED backlit ones). That covers all ambient lighting conditions then. Outside, the case doesn't reflect light blinding you and the display works in reflective mode giving amazing contrast. In low lighting (indoors where there is power!) the backlight can be turned on to use the display in transmissive mode. Hence why the FT-817/818 uses this and all radios are mostly black now. It was a design study that came up with a usability sweet spot. Our eyes and planet pretty much specified this design rather than it being an arbitrary choice.

Also outdoors, running portable, the reflective display uses only 6-10mW of power without the backlight turned on.? A great battery outcome. The blue LCD in the QCX was rather hungry compared to that and IMHO (sorry Hans!), as it was only effective in transmissive mode ,a criminal choice for outdoor usage. Had to get rid of that right away.

As always, buyer beware of people selling primarily functional things in weird or trendy colours. Don't differentiate your product by making it horrible to use.

Best regards,

Chris Smith M0XTE

On Thu, 20 Sep 2018, at 10:52, Hans Summers wrote:

Hi Alan

QSX enclosure outside dimension is 145w x 68h x 73d mm. The heatsink protrudes 25mm at the back panel. The knobs protrude 10mm at the front panel.

Even despite not really having an idle moment I googled a bit more about heatsinks (as far as black/white colour etc is concerned, radiation and absorption are equivalent). It seems that colour is a matter of preference, making a nice smooth protected finish, etc. There is not a significant heat absorption/emission benefit.?

What I read reinforces my opinion. I believe it will be the same with the QSX enclosure. Colour isn't going to save it from getting hot in the sun. It will make little, if any, difference. From your perspective colour should come down to personal taste. From my perspective it is a matter of pricing and logistics.?

73 Hans G0UPL

On Thu, Sep 20, 2018 at 12:28 PM Alan de G1FXB via Groups.Io <g1fxb=[email protected]> wrote:

Hi Al,

for trail carry I use army surplus pouches mainly for convenience & bash protection here in the UK rather than thermal reasons.....

though i'm sure that would also provide the required sufficient thermal protection in your situation.

(May have to make a cut out in the bottom of the pouch in the case of the QSX for the heat sink)

It's hard to judge size from the images supplied so far, only a little wider than the U3 case and 1/3rd / 1/2 as deep?

It looks to be able to fit in something similar to a US 100 / 200 Round pouch,

if it proves too small the 300 Round bag will possibly in addition hold batteries, AMU, and simple wire antennas...

or in Europe and NATO countries, the respirator / field bag are more easily sourced?

I believe IO groups already support polling?

I would vote for black to match the previous high quality anodized finished QRP Labs cases.....

Alan

On 20/09/2018 00:20, Al Clark wrote:

I'm sure Hans is getting overwhelmed with QSX requests, but I had to throw this one in before the QSX gets too far along.? My request is please don't make the enclosure black.? When you have a xcvr outside in the hot Alabama sun, a black case gets really hot - too hot to touch in fact.? And the high enclosure temperature probably doesn't do the electronics and display much good either.? A light color is preferable, like white or yellow.? I suppose red or blue might be useable, but I imagine those would get fairly warm also.? Actually, a gold or yellow anodized enclosure would be nice, but I suppose anodizing would increase the cost.

--

Al KD4EO