On Thu, Jul 25, 2019 at 08:27 PM, Andy Brilleaux wrote: Try this - rfsim99. https://sites.google.com/site/andyg0ftd/downloads Works perfect if using Linux / Win or anything that will run 16 bit

My previous method using the PIC involved setting the output to 10.000MHz connected to a relatively accurate frequency counter for monitoring purposes. Then I ramped the oven temp up to about 40C for

Yes…typo on my part …stressed out!! LOL!! Thanks for the correction Paul. Vernon

I guess you mean 10 ohm , not 10K, or that would be the problem. Regards Paul Sent from Mail for Windows 10

Hi Brian Just be clear for you. If the LM7805 is the standard T220 style its rated at 1Amp, if its the small version , the size of the BS170, its rated at the 100mA that small version is the

I'm sorry, I mistook the author of the linked calculator for another author. John Wetherell is apparently all well and with us, it's just that his personal page no longer works. -- Karlis YL3JG

Elsie sucks. Try this - rfsim99. https://sites.google.com/site/andyg0ftd/downloads Works perfect if using Linux / Win or anything that will run 16 bit Windows stuff. 73 de Andy

You can use various networks for impedance matching, see this: https://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html (the best calculator on this topic, but sadly the author is no more

Thank you both for your replies! As to Elsie, I tried it. The everybody's free version (student, thats looong ago) seems not support impedance transformation (and about 100 Euros for the pro version,

I have 3 of the 5 watt PA units and are of simple build. For the life of me I can only get one to work. There are 5 #105 capacitors, one 3.3k resistor, one 78L05 100ma voltage regulator, a FT50-43

This might provide some answers: https://www.rcarc.org/presentations/AB2EW%20Class%20C%20club.pdf Note the cap at the drain to suppress parasitic oscillations. -- Karlis YL3JG

If you use a LM78L05, it will current limit at about 100mA itself. When the heater has warmed up and the current drops, it will voltage regulate to 5 volts. It must be the "L" version.

Hi Peter, No wisdom inferred. I would be inclined to see if I could make some DC checks on that and surrounding IC Pins, The IC's in that strip are DC coupled

Are you using a switching power supply? Allison

You need to use Elsie, free to students. Go to www.tonnesoftware.com Geoff On 25/07/2019 18:44, Axel wrote:

What do you reckon to replacing the BS170s with one. Is there enough level from the XO to drive it? Obviously the connecting to the U3S would be a faff.

Hi, for my QCX, I would like to build the NB6M Miniboots PA from http://www.norcalqrp.org/nb6mminiboots.htm (~10 Watts) for 20 m. Now, I'm very curious, how I could calculate the values of the there

Hello Ted, Thursday, July 25, 2019 They look extremely elegant and professional, well done indeed! Best regards, Chris 2E0ILY mailto:chris@... qrc> Hi Don qrc> I went

I keep checking on it!! It's last update is: N6CVO-11 · 2019-07-23 22:01:42z - 2019-07-23 22:07:14z 128 MPH 60° alt 31836 ft 433TxC -1.80C 295.98hPa 4.60V 09S Pico-Balloon,Solar

Hello Alan, Thursday, July 25, 2019 I have often thought it would be a nice option for future kits to have an input for a 10MHz GPSDO as these are now pretty commonplace and cheap.