my d4d is off frequency, low by 2khz . do i decrease or increase capitance. it's at 14.272. thanks, ron kc0tdj

In my test, I used 1N4148 but any diode will do, like 1N914, 1N4001-4007, 1N5817 and etc. -- Thanks, Adam Rong

What diode is recommended for Steve's Mod?

Hi Conor EI6GSB, Thanks for reporting this. I have never met this before. If you have spare part, you can try to swap NE602 to see if it is better. Also, check if you have properly attach the final

Hi all again, After some more investigation I believe this simply may be a case of the transceiver overheating. I opened the case to inspect the board to see if there were any signs of component

Modification is not necessary if you want to get it work first. After you have time, you can consider these two modifications: 1. Replace C5 by a 105 monolithic cap (tolerance < 20%) to improve IMD at

I just received my d4d kit this week, and wish to incorporate all recommended mods. Will there be a file that lists all mods, or an update to the instructions that includes all? Bryan B. Brauer,

Steve, Thanks for reminding. We studied the spec while we apply the 4.3V power supply. The main impact parameters are: Conversion gain, Noise figure, and IP3i I believe the major impact is IP3i which

I would remove the diode in series with the 5V to the SA602. The minimum operating voltage for the SA602 is 4.5V and performance degrades quickly below 4.5V. Thank you, Steve. Your diode mod is

And the photo follows. The left side is the KD1JV diode mod, and the right side is the BH4DCL diode mod. -- Thanks, Adam Rong

Thank you, Steve. Your diode mod is effective. In my test, the carrier leakage improved by about 5 dB, as a side effect, both USB and LSB signals increased about 1 dB which is a surprise to me. I also

Hi all, I built the D4D kit a couple of days ago and it worked well. I didn't make any QSOs just yet, but the band conditions are not good so this isn't a problem. Yesterday, however, I powered up the

Folks, I have decided to join Japan Ham Fair 2019 this year. It will be a fast in fast out trip but I should be able to stay at QRP village booth for about 1 day from August 31 noon to September 1

Folks, I will be on vacation from August 6 to 11. I will reserve something at my shipping agent, but likely will not be able to cover all your need. The next shipping will be August 19. I still take

Many thanks for your information. good luck yves

samir, Nice job on the building and QSO made. You are welcome to join the contest this quarter. Thanks, Adam

just a heads up the oven resistor needs to touch the crystal case.

Hello, I would like to share with you photos and information about the kit that I posted on www.Laselki.net , I made hundreds of QSOs so far with the

Sounds good. I will modify the emitter resistor from 1.5k to 680 ohm and give it a try later this week. Just FYI: After applying the diode modification to reduce NE602 power supply voltage from 5V to

Yes, Q1’s collector should stay above 5V when 12_V is applied. Steve