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Thank you Adam by the suggestion, this is the way I meassure the power output of my WSPR/FT8 beacon (Vpp*0,35)^2/RL in this case ((17V*0,35)^2)/50 would yield 700 mW approx. The initial testing has

Colla, The diode mod suggested by KD1JV can increase RF output about 1 dB. Thanks, Adam

Colla, Glad that you can make QSO with D4D now. The efficiency of the TX driver and final is low because they are biased in type A or A/B. The power measurement is a bit tricky due to the DSB

No Conor I did not yet. I had only applied the input level mod but I decided later it wasn’t wise to start adding mods to a circuit I am not familiar with and then completed the building as vanilla

Did you add the optional modification diode to suppress spurious transmissions? If so, this will likely account for the output power drop. Conor wrote:

Although the power meter shows about 200-300 mW output the current is 22 mA on RX and 290 mA on TX, at 12Vcc this is 3.5W of power input, not sure what is the expected yield of the PA but even taking

Hi Conor, Thank you for the tip. The TX is working now. Although with very limited power. Hard to measure but in the order of 200 mW. SWR is Ok. 73 de Pedro, LU7DID

Does the TX light go on? If it does, check the solder joints for the three coils. If there is enamel still on the ends of their wires, they may not form a proper connection. I had this problem

RX apparently fixed, C2/C3 were the corresponding to 40m therefore the oscillator didn't started. Now going after the TX part which isn't working. 73 de Pedro, LU7DID

Hi Adam, What would be your suggested mod to transform the D4D into a single band multipurpose transceiver by generating the frequency from an external DDS? 73 de Pedro, LU7DID

Hi, Finished the build of the D4D kit without significant issues after a cold soldering prevented the VOX to work properly. Did some test during the build but not the receiver test. Upon finishing

There is no right way. Either way is okay. Thanks, Adam

Why not just rewind the right way? *Bryan B. Brauer, PE* *Consulting Engineer* bryan@...

Direction of winding does not matter. -- Larry Lovell 73's N7RGW http://QRVTronics.com <http://qrvtronics.com> Cell: 214-697-1729

In your application it should make no difference.? It's when you are winding a two or more winding transformer that it becomes a problem as the wires won't come off the core in the proper

Hi, I just wound this with the opposite handedness of the example in the build instructions. I just wanted to be doubly sure that it doesn't matter, for this particular component. It's fine this way,

Hi Adam, Thank you for your quick response. It turned out to be a cold soldering point on R16 GND side. 73 Pedro, LU7DID

Hello, This email message is a notification to let you know that the following files have been updated in the Files area of the [email protected] group. * /D4D Kit Documentations/D4D Kit Assembly

Colla, Sorry for replying late. Check if you have swapped Q5 and Q6. 2N3906 and 3904 are very similar looking. Thanks, Adam

Hi, Building the D4D at Step 2 WITH the MOD on pag 25 implemented when testing the step upon powering the circuit the relay clicks but the amber LED goes and stays on. On previous STEP 1 testing the