AQRP is looking into a Square Wave "Power Calibration Generator" which outputs a square wave at 100mW and 10uW into a 50 ohm load. Should be really useful for WSPR aficionados. Very simple design (Osc

#alignment #dummyload #test

The DC voltage reading on the sense output of the dummy load is about 0.6 Volt too low because of the forward offset of the silicon diode used. Add 0.6 Volt to the reading first then do the Vpeak-to-p

#alignment #dummyload #test

This is a great on line calculator I use, has all the conversions built in, you just need to enter any of the known values and it will calculate the others. https://www.analog.com/en/design-center/int

#alignment #dummyload #test

I made a table to convert Vpk to watts and dBm https://www.qsl.net/v/va3rr//xls/QRP_dBm.docx

#alignment #dummyload #test

Hi Charles, Bojan is correct in his calculations and formulas. The difference to the above is that the conversion from Vpeak to Vrms is inside the Squared values. 0.707 Squared is 0.5 so 6.3 * 0.5 = 3

#alignment #dummyload #test

The DC output voltage is peak voltage. It is a simple one diode and 10nF C in detector. So, what the Dummy Load Instructions says is right. Power = peak voltage * peak voltage / 100). As for sinus wav

#alignment #dummyload #test

Greetings all, When using the QRP Dummy Load and measuring the voltage on the Power pad, am I measuring peak voltage or the equivalent to peak-to-peak voltage? I ask because I just completed a 40M QCX

#alignment #dummyload #test

Up here in the frozen north Digi-Key has a Canadian website and, for purchases under $100, ships FedEx overnight for a flat rate of $8 CAN (less than $7US). They are my go to place to purchase electro

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To say nothing of the hours and hours of pure fun scavenging the "usefull" parts from those defunct chassis. And on a few occasions repurposing the chassis to put your latest project into. 73 Phil WA8

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I still miss Radio Shack where and when I could walk in and look for the simple parts and even talk with a ham or two. They used to hire kids who were hams as they knew something about electronics and

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If only! Here in Spain none of the big suppliers offer free delivery on small orders. DIGIKEY charge $22 on orders under $60.

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For a while, Arrow Electronics was shipping Next Day free. I have no clue how they did that, as there was no minimum order. Jack, W8TEE

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Roy, I was hoping for a reason to share this. In about 1967, well before I got my ham ticket, my dad encouraged my my brother and me to tinker in the engineering sciences. After we built a Knight Kit

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Thanks for passing on the Digikey info Jim. One less thing to give us grief is welcome. 73 Phil WA8YAN Sent from my Verizon, Samsung Galaxy smartphone

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Okay, help me understand this! Why in the world would any company provide a discount (free shipping) for an order that was handwritten and would have to be hand processed and paid for with a paper che

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Good news!! This morning I got confirmation from Digikey that YES they still ship (via ground) for free to lower-48 USA destinations on prepaid orders. You have to find a stamp, an envelope, and a che

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Jim, You forget those comments are made by hams who where there, did that, over 60 years ago. In todays light our comments were for only historical information, not to be taken seriously in todays sol

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Lightbulbs for dummy loads? Maybe with tube finals, but the dubious matching to solid state finals almost guarantees failure. I just pinged Digikey to see whether they still offered free shipping on p

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I also used a 100 watt bulb as a dummy load before I could buy a Heath Cantenna back in the 60's. Had to keep in mind that its cold resistance was different than its hot resistance, no big deal with y

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John, I think you meant the NE-2 neon bulb? Still 5 for a buck from All Electronics. 73! Mark

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