Re: [Elecraft] [K2] PA ALC problem on CW

Gents, Looks like I forgot to share the outcome of this story. In the end, I got new MAX534 and replaced it, and everything is now fine. I can't tell you whether the chip was deffective from the beginning, or it was damaged by EMC during my soldering. Anyway, things are OK for quite some time.

Re: [Elecraft] [KX3] Boost Buck 13.8 V Regulator

Hi Phil, I've seen similar approaches for regulating the heater voltage a vintage Russian military tube receiver. There's a series resistor in the circuit that's connected when the batteries are fresh-charged, and this resistor is bypassed with a switch when the battery voltage falls inside

Re: [Elecraft] why mix rf connector types within the product line?

Generally it depends on what you're doing in your radio hobby. Practically all types of connectors can be (and have been) used for our amateur radio purposes with more than acceptable results. When it comes to RF measurements that need to be done repeatedly with high precision (especially

Re: [Elecraft] K2/10 upgrade question

Don, You're absolutely right. The only limitation with such approach will be that you can't use KAT2 as internal auto-tuner, and you'll have to bring the KAT100 external tuner to the portable setup (adding more weight and power consumption). I'm in a similar cross-road with my K2. I finally

Re: [Elecraft] 12 bit Time and Frequency Domain K3/Alpha 9500 Screen Shot

Hi John, These peaks could be nonlinearities from your scope amplifier. 73, Nikolay / LZ1NRD - Цитат от John Seney (john.se...@gmail.com), на 25.11.2012 в 22:13 - Season's Greetings Elecrafters: This weekend I had a QSO with a West coast station that related that he was having

Re: [Elecraft] USB sound dongle

The real ADC resolution - the one specified as ENoB (Effective Number of Bits) - is always less than the theoretical one (written with big letters in first datasheet page). IMHO there are a bunch of parameters more interesting than this theoretical one, like ADC linearity monotonicity, SFDR,

[Elecraft] KX3 phase noise

Dear Elecraft Team, Is it possible to publish the KX3 phase noise measurements on this link: http://www.elecraft.com/K2_perf.htm#Main%20RX%20Table Thanks in advance. Regards, Nikolay / LZ1NRD - Mail.BG: Безплатен e-mail адрес. Най-добрите характеристики на

Re: [Elecraft] KX3 phase noise

Thanks Wayne, I'm not in hurry at all, just wondered what are the measurements of the youngest Elecraft family member (not that I listen at measurements from my speaker, but just of pure curiosity). (And guys, don't smile/laugh - everyone of us is just looking for a good excuse to say ...OK,

Re: [Elecraft] Buying a K3 in the UK?

Dave, I totally agree - there's some unexplainable magic to me that when being converted from US to EU, prices somehow keep their numerical values (while at the same time currency is changed). This is valid for whole EU, not just UK. And just because I don't like the reseller prices (and I

Re: [Elecraft] Living with EMP

Gents, I think it's ESD, not EMP. When the latter occurs, people have more troubles than usually... Regards, Nikolay (LZ1NRD) - Mail.bg: Безплатен e-mail адрес. Най-добрите характеристики на българския пазар - 20 GB пощенска кутия, 1 GB прикрепен файл,

Re: [Elecraft] [K2] PA ALC problem on CW

Gents, Today I got my replacement MAX534 from Digikey. PCB rework went fine, but this time I decided to put a high-quality DIP16 socket. If things go well for a while, I can solder the IC to the socket to avoid contact problems... All tests went well - the transceiver power can now be fine

Re: [Elecraft] A new K2 power issue?

Hi Gary, I have built only 1 K2, but mine has the same power consumption (240mA) during RX. So I think your current consumption is OK. You can have some deviations of your consumption because of LCD backlight mode (day/night), S-meter mode (bar vs dot), post-mixer amp Q22 biasing so don't worry

Re: [Elecraft] My K2 adventure with antenna static discharge

George, Thanks for reminding that we should keep those sweet K2s alive and in good health. Typically, if you have your antenna attached to the K2 ANT connector, the DC path through R67 R68 (RF Board) won't allow a static built-up. But as you already shared, the question is what happens when the

[Elecraft] [K2] PA ALC problem on CW

Hi everyone, I have an issue with my K2 internal power amplifier. After completing the kit assembly I went on to pass through the transmit test procedures with a good dummy load, but I got the famous HiCur over-current warning message when using the TUNE button (any band, any POWER setting).

Re: [Elecraft] [K2] PA ALC problem on CW

Hi Don, Thanks for your suggestions. I disconnected pin 2 of MAX534 and applied external control voltage there (simulating a healthy channel A of the DAC). Fortunately, now I can control the power output from the transceiver from 0 to MAX. The sine wave looks undistorted and exactly on the

[Elecraft] [K2] T/R switching

Hello fellow hams, One more K2 (#7293) was born this week in Europe - thanks to the Elecraft team for designing this kit and making it available for the ham crowd. The radio is now assembled, but I have small issues with the testing. During the initial testing on 40m reception the radio was

Re: [Elecraft] [K2] T/R switching

Hi Don, Thanks for your answer. The output of the 8V voltage regulator is just perfect (for a 10% device) - 7.98V. I was wondering why I get 500mV voltage drop across Q1 Q2, but if you say that's OK, then I'm fine. Slightly offtopic - I had also another failure of 2N7000 - again in Control