Sunday, April 19, 2020

UBITX Project

During this Covid-19 crisis the general advise is to stay at home.
Since i have a box full of unbuild projects i don’t have to bore and picked the UBITX to finish.
The Ubitx is an allband QRP hf transceiver and comes assembled for a very fair price.
I choose to upgrade to the Nextion touch display which includes a software upgrade for the Raduino.
There is a lot of information on the internet and also the new UBITX kit includes such a display.
For now i build the default kit and later on i will add a audio agc with a lm-317 audio ic.
My Ubitx with Nextion touch screen, build in progress

Saturday, February 8, 2020

Chinese CT-62 USB cat cable.

My original Yaesu CT-62 cat cable has a serial connector which is not very common nowaday.
So i ordered a Chinese clone for less than 6 euro incl shipping.
As soon as it arrived i decided to test this cat cable on my FT-817 and HamRadioDeluxe.
The cable was recognized on my Windows 10 pc, but it gave read errors while starting HRD.
So time for some measurements.... First open the USB connector and do this very careful to avoid dammage of the plastic enclosure.
You will see a small pcb with 3 wires and a uart ic.
With a multimeter i measured the mini din connector on the other side of the cable and concluded that the tx and rx wires on the small pcb where reversed...
Red and White wires are reversed soldered on the pcb

                                     This is how it should be! White wire is RX and Red wire is TX.
After changing the RX / TX wires the Chinese CT-62 cable works fine.

Yaesu FT-817ND battery replacement

Altough my FT-817 is not much used since i bought it new 10 years ago, the battery has lost it’s power and could not be fully charged anymore.
The original batterypack FNB-85 is quite expensive and due to the fact that i hardly operate on battery i decided to replace it by a third party battery as sold on ebay.
For less than 20 USD incl shipping you get this:

This Cameron Sino FNB85TW replaces the original pack and has the same dimension as the original battery.

Fits perfect. Charged and tested the FT-817 on battery power and it’s up and running again.

Wednesday, December 18, 2019

Sommerkamp TS-680EDX

Got a very nice TS-680EDX for free, the first so called Sommerkamp Coffee Warmer from the late seventies. Original boxed so a very nice addition to my collection.

Saturday, September 28, 2019

Sommerkamp TS-788 DX Coffee warmer.

Back to the late seventies and early eighties this Sommerkamp was a dream for many cb operators.
Frequency readout, 100 watts of output all together in a small enclosure.
For most of the operators this transceiver was way too expensive.
Beside the high price it also had some flaws; FM was too narrow and the pll was not stable enough.

Now many years later a 788 has arrived in my shack. It looks allmost as new and it has the complete Maurer modification. Very good FM modulation, stable as a rock due to a complete new designed oscillator with SIxxx, tcxo, menu to adjust some settings, channel or frequency readout and much more.

Hans PA3HGT made a picture of his Maurer 788, note the new added pcb by Ir. Maurer.

Wednesday, June 12, 2019

President Adams CB radio

One of the best cb radio’s; the President Adams.
For a cb mobile radio it is really big!  Original am/ssb with 40 channels it was and still is state of the art despite it’s age (end seventies till mid eighties)

Mine is allmost as brand new and is modified by Maurer in Austria.
FM was added and a vfo as well. Even the face plate where the push knobs and frequency readout is placed, has been modified.

A real collectors item.