What method are you using to reduce the signal output? _._

Jeremy Okay. I apologize if I misunderstood where you were going with this. You might want to ask Farhan if he is interested in selling bare boards, or even bare boards with the parts in a baggie so y

Sounds like you are preparing to clone the intellectual property of the original designer? This is problematic because many clone sellers try to say the original designer is responsible for maintenanc

Pacific Antennas purchased the whole company and product line from QRPKits (KI6DS, Doug Hendricks) about 3 years ago and has had the BITX20 kit marked as Out-of-Stock since that time. Due to the long

Jeremy To the best of my knowledge, Farhan has not sold bare PC boards for the uBITX series. Earlier BITX series transceiver can be purchased in bare board, or board-plus-parts kits. Some of these are

RST signal reporting (Readability, Strength, and Tone) are not the same as S-unit power levels. RST reports are subjective, while if the receive station has AGC enabled, the level of his/her received

http://www.w1hkj.com/beginners.html _._

#digital #ubitxv6 #psk31

Andrew You probably know that there are two different types of USB cable. Some only have the DC power leads and are used for charging downstream devices. Others include the two data leads and are used

Jon A couple things to look for. Weak power supply (i.e. wallwart). The rig needs a solid 12 volts at 3 or more amperes to service both receive and transmit modes. Ground loops can cause oscillation i

#bitx40help #noise

Jerry By April of next year we should have an AI system front end for LTSpice. We just tell it what the end result should be and it uses Spice technique to design the ultimate transceiver! Google's "T

#ubitxv6 #v6

Jerry That 2N3904 running a kilowatt out sounds interesting, especially with April 1st coming up soon. Might be interesting to see what those who are Spice-literate can come up with! 8-) Arv _._

#ubitxv6 #v6

Raj I guess the point thus far is that just doubling the supply voltage to the finals does not support any significant increase in power. Later today I will be adjusting the idling current to the fina

#ubitxv6 #v6

Examples in the arduino IDE can be used to make sure the LCD screen is good or bad. For a 1602 LCD just make a short program that writes your name on line one and callsign on the second line. If this

Jerry It has been a couple of years since I did any LTSpice simulations. Your post is what got me back to using it. I expect that the simulator will be adequate for evaluating alternative driver devic

#ubitxv6 #v6

Jerry I changed the voltage on the finals from 12V DC to 24V DC and could bring the input back up to 0.05V RF before the output started to deviate from a sine wave. Interestingly, the power output did

#ubitxv6 #v6

Jerry Thanks for all the effort that went into making the RF PA and drivers available for simulation. I found it interesting that at 0.05 volts RF on the input the output is distorted on peaks at abou

John Maybe fun and educational, but can also be frustrating until you know exactly why the capacitor failed. Not knowing that may cause a feeling of foreboding because the problem could happen again.

It is not normal for a crystal filter to pass audio. The wording in instructions may be a bit misleading (terminology in India is slightly different from terminology in other places). If you insert ra

Vince Interesting. I went out to lunch and then revisited the Arduino IDE site and now it does not put the request for personal info ahead of the download request. Very interesting indeed. Arv _._

Dean, and others... The Arduino IDE has always been problematic for Linux users. Due to a licensing dispute the version in Linux repositories is very, very, old. We can install from repositories but d