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qmx with tiny lcd display

  

Has anyone ever tried to install a smaller LCD display in a qmx. Is there any experience with this?

Which one can i use?

like this one
https://a.aliexpress.com/_Ew3iRHL

73' de dl9tx
 

Hi Stefan,
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Not on a QMX, but on a U3, I had swapped standard 1602 with a mini 1602, it worked fine. I believe as long as it says 1602, they are compatible.
But smaller size may put some stress on your eyes. It's OK for U3 because we don't look at its screen that much.
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Hope this help.
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73, Wei
  

Hi Wei, 
good news. That gives me hope that I will find a suitable one. I think I need to order more and try them out. Yes, that's definitely the case with the eyes.
 

Just curious, why would you replace it with a smaller one? Are you trying to make space for something else by shrinking the LCD?
 

Yes, find a smaller display and rotate it 90deg is the first step i will do.?
Creating enclosure with a new arrangement of components and 3d printing the next step.
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Try this one:
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I used this before instead of a standard 1602 LCD and it is compatible
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73, Barb, WB2CBA
 

When going from an aluminum housing as provided by QRP Labs to a 3D printed one, I suspect that, due to the poorer thermal conductivity of the plastic/air matrix, high temperature issues may arise unless means of ventilation or heat conduction is provided.
I have seen this overheating occur in 3D printed balun housings, where the balun was properly sized but there was no/insufficient airflow and the heat buildup due to normal losses eventually caused the housing to melt and the core was visibly damaged.
Making one or more of the larger housing faces from sheet aluminum (or even thin heat sink stock) and using some thermal interface material may be useful in conducting heat out of the box.??
73, Don N2VGU
 

Thank you Barb, thats a really good information that i need.?
 

Yes Don you have right, it is planned that the inside of the housing will be completely covered with copper foil. The heat derivation is a big issue.
 

find a smaller display and rotate it 90deg is the first step
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The only reason I can think of for doing this, if I were to do it, is to turn the QMX into an HT. What's your plan?
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73,
Yoon KM6KJI
 

Hello Yoon,
yes you are correct with your assumption.Its planed a HT like the KH1 with battery, speaker and perhabs automatic tuner inside. On the other side,since the last weeks, i'm trying a manually tunable telescopic whip with ferrite core.
 

Thank you for this information Barb! I also have been looking for a smaller display.
I have not made the QMX but see that it has a HD44780-compatible LCD display. I built the DDS Synth VFO and it works very well. I want to build it into my TXVR for backpacking and hiking. The problem is that the LCD display is too big for my need (and I dont need two character lines just the freq) and so make the panel larger. So this should save some space!

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