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Kevin, I added a 47 ohm resistor between puns 15/16 and the voltage regulator. This reduced the voltage drop across the regulator which reduced the amount of heat that needed to be dissipated by the

Yes. 70 volts peak-to-peak is? 70/2 = 35 volts peak,? is 35v/sqrt(2) =24.75 volts rms. Into a 50 ohm dummy load, that's volts*amps = 24.75vrms * (24.75vrms / 50ohms) = 12.25 Watts. Though when you

Hi Allison, Given the formula for Watts vs P-P ?(Meca electronics) one would use ?the peak voltage(35Vp) and that would crank out to about 12.25 watt, which I believe I had at one time, but now at

From the sounds of it, this temperature measurement was taken in open air, indoors @ room temperature.? It will get considerably hotter in an enclosure, and even hotter yet if that enclosure is

what size resistor Howard ? and, where is it placed exactly ? kevin

The reason Raspberry Pis are so inexpensive is they take advantage of the price advantage of using basically the same processor that is used in hundreds of millions of radio transceivers, already.

I am using a metal box but it is powder coated and so not a good ground.? The instructions recommend a heavier ground wire from the power ground to the main board.? I did this and also ran a ground

Cool. Yes, it can safely work at that temp. Some people have put a resistor in series to reduce the temp, but the heat sink is easier. The resistor is a good idea if you are much closer to the power

Ok, i just put one on it. on it's datasheet, looks like it can operate up to about 257 degrees?fahrenheit, so at 135 degrees it seems safe. kevin

Farhan gives a hint on the uBitx description to consider adding a second crystal filter at a lower IF. It would involve retuning the bfo and selecting it. I would imagine its been done by someone. 73

Gordon Those Chinese boards look pretty good. Hang in there. We are all pulling for you. Arv _._

Regarding my external relays idea : The Chinese boards arrived, and I believe the digikey parts also.... then I had to go to the emergency room with incredible abdominal pain that turned out to be

7805 5 volt regulator for the Arduino. Adding a small clip on heat sink is? good idea.

so far, the hottest thing i have found is that large transistor that sticks out the side of the raduino, on the front side of the unit, don't know what that part is for, possibly audio ?? anyway, i

Picture added.

On Sat, Aug 18, 2018 at 08:58 AM, David Nelson wrote: > > Bo you got a place holder but no photo? kc2ipx > > On Sat, Aug 18, 2018 at 11:07 AM, Bo Barry < bobarr@... > wrote: > >> Photos section

So, I thought I would try just 15 volts straight into the rear power connector.. wow.. 30 watts ssb on 20 meters into a dummy load. i have three temp monitors on it to see what all the areas do, so

So this 1db flat gain and power from the reference? I’m sure it can be done by doing some compensation at the gate… Sent: Saturday, August 18, 2018 1:39 PM To: [email protected] Subject: Re:

Hello, Havent posted on here in several months, long story short; due to illness, family drama, lack of time i am considering parting with the following items for trade or cash. Please note i have do