There is another possibility, that Groups.io unsubscribed you due to bouncing messages. If you login to Groups.io and go to the QRP LABS group page and click on the subscription link on the left you w

QRP Kits / Pacific antenna makes a stepped attenuator kit that sells for $25 and it will easily handle 5 watts in. http://www.qrpkits.com/attenuator.html I would reduce the supply voltage to the QDX t

The .deb files for JTDX are here : https://sourceforge.net/projects/jtdx/files/jtdx_2.2.159/Linux/16-bit_audio/ The comments are : Binary installers: -amd64_ub20.deb - installer for Ubuntu 20, -amd64_

Jim : Well I would start by installing an application called "COG" from the Google Play Store. This will show you some detailed information about your Chromebook including storage, processor type etc.

Paul : On newer Chromebooks all you need to do is to enable the built-in Linux environment to run Linux apps alongside Chrome and Android apps. There is no need to use Crostini. The internal Linux is

I agree with Peter on this. Also sometimes the shorter transmit cycle on FT4 (7.5 seconds) can work to your advantage when there is QSB. I have found that often the less crowded conditions on 20m FT4

I built my REV1 QDX for 12v operation and I have been running it at 12v with no issue. I had ta similar idea for a "poor man's voltage regulator" by stringing 3 or 4 rectifier diodes in series to drop

I forgot to add that if you decide that you need some additional USB ports for the Pi Zero, I found these cool little USB hubs that are designed to fit the Pi Zero and expand the USB to 4 type-A ports

Pete : Have you heard of the DigiPi ? http://craiger.org/digipi/ Rather than a full-blown Linux / Raspberry Pi OS distribution it is more of a Digimode Linux appliance using Pi Zero Hardware. It is st

Mitch : To answer you question, yes you have the ability to talk to external sensors with the U4B. QDOS Basic has I2CR and I2CR16 commands that read from a device attached to the I2C bus with either 8

Enabling Linux on Chrome OS : https://support.google.com/chromebook/answer/9145439?hl=en and a list of Chromebooks that support the native Linux (Beta) in Chrome OS. https://sites.google.com/a/chromiu

If you have a newer Chromebook with an Intel architecture you don't even need to install GalliumOS. You can run native Linux (Debian) applications alongside Chrome and Android apps. There is a beta Li

It just occurred to me that my twists were 360 degrees (i.e. a full revolution of the screwdriver used as a grip). If the intent was to do 180 degree twists (which might make sense) then I would ended

#transformer #qdx

I finally completed my REV 1 QDX yesterday and made my first QSO with it on FT8. My only build issue was with T2. I measured three 20cm lengths of wire for the trifilar winding and twisted them for 50

#transformer #qdx

Mark : I suspect that few receive stations actually go through the soundcard calibration procedure so that is likly why you are seeing varying reported frequencies. Nothing to worry about, the importa

#u3s

QRP Kits / Pacific Antennas used to sell a little kit (now retired) that was handy for this scenario. You could easily reproduce it from the schematic. (see link below). http://www.qrpkits.com/files/L

My QDX + enclosure showed up on my doorstep this morning. I guess I never looked too closely at the dimensions, this thing is pocket-sized. I was expecting an enclosure of about 5 x 6 inches it is mor

I happily stand corrected ! I guess that the term MFSK by itself is misleading. Digging a little deeper, DominoEX definitely uses (IFSK) incremental shift keying so it will be fine. In fact just liste

Jim et al : The QDX is not an SSB transmitter. It is only compatible with modes that use sequential FSK (i.e. one tone at a time). This rules out any modes that use MFSK (i.e. MFSK16, DominoEx, Olivia

I would also be game to try JS8 on the QDX. I have used the JS8Call application once on 6m and it looks promising. It gives you all of the benefits of the FT8 protocol but allows you to ragchew, albei