This is my Siemens E-311 b1b receiver. It is capable of receiving CW, AM and SSB signals from 1,5...30 Mhz. A known issue with this receiver from the 1960s is the fact that all MP capacitors may initial fail due to an ageing effect that first increases capacity and finally stops after the capacity has dropped to nearly zero. I have replaced all MP capacitors. After that a fresh revived receiver was the result. Only minor alignment was needed to get this result. 50% of the exchanged capacitors turned out to be out of tolerance. Some way to high, and others having nearly no capacitance at all. This is an overview of my boat anchor station. Starting from the left, a Rohde & Schwarz SK-010 shortwave 100 watts PEP, CW, RTTY and AM transmitter. On top of it there is an AL811H that I sometimes use to boost the AM signal of the transmitter from 20 watts carrier to 100 watts. Since the power amplifier of the SK-010 can be operated in a linear mode, I have sliced in a phasing SSB generator that is able to produce USB and LSB signals from 3600kHz to 3800kHz. No modifications were needed inside the SK-010 apart from slicing in the generator between the exiter and the final. The little green box on the shelf is the speech amplifier that is used for the SK-010 (AM and SSB). In fact this is a modified Rohde & Schwarz Funk-Fernschreib-Betriebsgeraet. Beneath this box you can see the E-311 b1b, to the right of that a Siemens E-309b. Furthermore on top of that a Telefunken E 863 KW/2 with a nixie tube display. And finally on the right a Telefunken ELK 639. When tuning the antenna system and / or the transmitter I use a so-called quiet tuning system; a bridge circuit and a dummy load. This has also been described by PA0FRI.
Posted on: Thu, 09 Oct 2014 22:07:42 +0000
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