R&S NGMO2 Front Connectors
The Rohde Schwarz NGMO2 is one of the lab power supplies that I use most. Having the connectors on the back is not convnient most of the times. I always wanted to have the NGMO2-B0 option that consists on a box that is attached to the bottom of the power supply and provides power and […]
R&S EB200 Miniport Receiver Dial Knob
I was lucky enough to get a Rohde & Schwarz EB200 Miniport receiver in working but less than mint condition. Apart from cleaning and fixing some bumps on the covers, the dial knob was very broken. This knob is a custom part designed by R&S that proved impossible to get in 2023. Repairing the original […]
Elecraft K3 “ERR 12V” Fix
The Elecraft K3 is a very well known HF transceiver with a great reputation and it follows quite a different philosophy from what (mainly japanese) competitors were offering at its time. This particular unit, from my good friend Angel EA4XT started giving “ERR 12V” and the output power dropped to a few watts each time. […]
Icom IC-7200 Cammo Paint
I once saw pictures of a beautiful IC-7200 with a few variants of cammo paintwork. It always remained in my mind to one day get one, but I never saw it available. So I bought a used 7200 (I should have chosen one that was not mint, like this one was…). I completely disassembled it, […]
Rohde & Schwarz FSIQ IF-Filter Module Repair
The result of buying a “defekt” FSIQ unit from eBay Germany was that I ended up with a huge instrument lying around for months, with little hopes of ever getting it repaired. The RF CONVERTER module had a (unrepairable for me) YIG unit and I managed to get a used, but working, RF CONVERTER module. […]
KORG MS2000 synthesizer repairs & restoration
This is a legendary synthesizer with many knobs that allow for direct-access to many functions. It sounds great, looks great, and it is a great tool to learn about analog sound synthesis, but there are better synths now and it is difficult to justify the usual price. I came across a beaten unit, non working […]
Tektronix MDO3014 50 Ohm inputs repair
My MDO3014 oscilloscope seemed to work fine with the high impedance probes but when I checked the inputs at 50 ohm with the fast risetime pulse generator from Leo Bodnar (link) the traces did not look right… three of them clearly showed ringing: Checking the input impedances The first thing […]
Icom IC-RP1510 “R3” Repeater
I was asked to repair/refurbish the “R3” (now RV54 with the new legislation) repeater from URE Guadarrama, usually running in a privileged location in the Alto del León (1.150 m), around 50Km north-west to the center of Madrid. The repeater had developed severe loss of sensitivity and also TX range. Both the repeater and the […]
Icom IC7300 RTC Fix
My friend Nacho EA4GZR kept complaining about his Icom IC-7300 not keeping time as it should, gaining “a lot” more than expected as compared to the companion IC-9700 that he has sitting next to it. The IC-9700 has a NTP client, so it was easy to him to see how much the clock was gaining […]