Tuner ENV578E1G3 Tuner from 1996. Main chips are TSA5511AT and MT06A.
While TSA5511 is the PLL Synthesizer, which generates all required frequencies, the MT06A is unknown to me. But it must be the RF mixer, which produces the IF output by mixing input signal with PLL synthesizer output.
Connector has 5 small pins and 4 large pins. In my listing, numbering starts with outermost small pin. To check against reality, compare against my image from the original TV board.
Antenna Tuner, designed by N7DDC, 1.8-50MHz, up to 100 Watts. Bought for 97€ in 12/2021.
OLED display and tune button Power switch, power supply connector, antenna and TX input connector 15 relais… The PIC16F1938 microcontroller References ATU-100 mini User Manual
ATU-100 Extended Board User Manual
https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards
http://oe1iah.at/Hardware/AutoTuner_ATU100.shtml
Large thread on QRPForum.de (german) - https://www.qrpforum.de/forum/index.php?thread/13177-auto-antennentuner-nach-n7ddc/&pageNo=1
ATU-100 mini original thread (russian) http://www.sdr-deluxe.com/forum/7-17-1
RM Italy produces nice RF amplifiers. Some of them are for the CB “Export” market and produce a lot of watts for a few bucks. The official ham radio amplifiers are much more expensive. They cover the common ham HF frequencies between 3 and 30 MHz. The CB ones focus on around 27 Mhz of course.
For RL-203, I read that it is possible to modify such a cheap amp to use it on complete HF range.
This is a power supply from the 80ies or even older. It contains a linear regulated power supply and a speaker. It offers 13.5 volts DC at 25 Ampere. Weight is about 10 KG, and this weight comes mostly from the big transformer.
There is plenty of space inside the casing. We can see the transformer. two large 10.000 µF capacitors, the speaker on the right. 4 regulator transistors are with their heatsink at the left.
This post describe my effort to fix a broken M8044 PDP11 RAM module. For tracing down the bug, I’ve used QBone.
I own a defective M8044 RAM board. This board came as part of my OBA-11 PDP11. It was obviously checked by DEC, found to be broken and has a red defective badge.
Setting up test bed I’ve created a testbed, consisting of:
QBone An unused backplane H9278-A with 8 slots The device under test, the M8044 As power supply, I took a 5V/4Ampere power supply from my parts bin +12V (used by M8044) supply comes from a lab power supply First test with QBone: Check if board responses to bus requests QBone has its tests and many features in a single executable.
What is QBone? QBone is a fascinating project by Jörg Hoppe. It is based on a PDP QBus module that can be inserted into any QBus backplane. It implements all features required by the QBus, so this module looks like any other QBus module from the PDP11 perspective.
The module integrates a BeagleBone Board (BBB). This is an ARM-based modern computer, like Raspberry PI. The biggest advantage of BBB over Raspi is: that the board contains two separate I/O processors called PRU (Programmable Realtime Unit).
My DEC VAX 4000 boards All boards seem to come from a VAX 4000-300 machine. See http://gunkies.org/wiki/VAX_4000_series
ebay seller text
DEC VAX 4000-300 Boards CPU KA670 L4000 in Module Plastic Case (99-08536) 2x MS670-CA L4001-CA und 1x64MB Clearpoint Memory KA670 CPU board 22 Bit QBus board. CPU clocked with 143 Mhz. CPU chip is called REX-520 There is a FPU on board called CD523.
Built-in Ethernet and 2xDSSI (disk) controllers
DEC Digital OBA11-MF bought in poor condition from ebay. It has no case, has some physical damage. Sold of course as defective.
All together this seems to be a kind of “embedded” PDP 11/03 with only a bare minimum of boards and no intention for extending it later on. Maybe used as a control unit in some chemical plant or whatever. here someone has a picture of another device like this.
I own some old PDP11 parts. I try to complete these to have a minimal set of cards to boot the PDP11. This is seen as a long term task and may last several years…
Activity was started in February 2017. In January 2021, I have spent 91+161+3*90 = 522€ on that madness, without any results so far :-) .
In 2022, I could buy a basic PDP unit, without case and in bad condition.
Einfache Löt- und Entlötstation. Gekauft vor ungefähr 10 Jahren. Funktioniert sehr gut.
03/2022 wurde der Lötkolben nicht mehr warm. Vermutlich Heizelement defekt. Das Gerät zeigt direkt nach dem Einschalten kurz “u01” an, evtl. eine Firmwarenummer.
Am Lötkolben-Stecker sind 4 Kontakte, zwei für den Thermofühler (rund 2,4MOhm bei 25°C) und zwei für das Heizelement. Ich messe am defekten Kolben 2,2 Ohm. Meine Vermutung ist, dass das Element einen inneren Kurzschluß hat. Es handelt sich um einen 24 Volt / 60 Watt Lötkolben.
