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Tuesday, August 13, 2024

It's almost QMX time!

I have been paying close attention to the QMX Assembled Kits Status page for weeks now. On July 29th, i was 167th place in line. As of yesterday, i am in 33rd place in line. They've really been pumping assembled units out, and I'm anticipating getting an e-mail notice about mine any day now.

I've also been paying close attention to the QRP Labs iO group e-mail reflector and have been noticing that it's critical that the input voltage to the QMX does not exceed 12 Volts in order to not fry the finals. The problem is, of course, that any fully charged battery is going to have a voltage of 13.8 or 13.4 Volts on it. I know, that voltage is not under load, and will drop some as soon as you do put a load on it - but still, after waiting since April, I don't want to take any chances of frying this guy the first time I power it up. That would be just my luck!

So I ordered a 12V Voltage Regulator from DigiKey. This one is manufactured by SparkFun Electronics - I have a few of their kits and come to think of it, I didn't check to see if they have these in kit form - (I have since checked, they don't)


The cost was nominal - only $15.00 and since I don't have any LM7812's laying around, by the time I ordered the individual components and parts I would need to cobble something together of my own manufacture, with shipping costs it would probably exceed this. This little guy will bring any DC source as high as 36 Volts, down to a regulated 12 Volts.

Easy peasy, the input leads will get connected to alligator clips and the output leads will go to the required 2.1mm power plug needed by the QMX. I already ordered and received a few of these in the meantime. So I will be ready for some QMX fun if this arrives at my QTH in the next 2- 3 - 4 weeks. And conceivably, this will accompany me up to Alexandria Bay when Marianne and I head up there in late September, early October for our Anniversary. There are two state parks close by that can be POTA activations.

Fingers crossed!

Fingers crossed for Sunday, too. Both WeatherBug and WeatherUnderground are calling for cloudy skies with a 50% to 70% chance of showers and thunderstorms. Best case scenario might end up with me setting up in the backyard with the EFRW to the Jackite. Worst case scenario might mean operating from the shack. Well, heck ........ I never come close to the top, anyway, so I really shouldn't care as long as I get o participate.



Boo! Hiss!

To end this post, some photos from last night's NorthStar training:










72 de Larry W2LJ
QRP _ When you care to send the very least!

3 comments:

  1. Anonymous9:14 PM

    My LNR 3b has the same voltage limitation. I stuck with my tried and true nimh AA cells. I usually run 8 for 9.6 v and about 4 watts out. Or I can switch to 7 alkalines for about 10 v. I don't mind loafing along. I want this radio to last a long time!

    ReplyDelete
  2. Anonymous8:10 PM

    Do you have digi key part number? Tnx

    ReplyDelete
    Replies
    1. Part Number: 1568-COM-18732-ND
      MFG: SparkFun Electronics / COM-18732

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