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admin - Sunday, August 31, 2014 at 00:59:50
KW 204 transmitter - front view.
admin - Sunday, August 31, 2014 at 00:56:18
KW 2000A ssb transceiver - inside view, top, when top cover hinged open.

Submitted by Skywave, Aug. 30, 2014.
admin - Sunday, August 31, 2014 at 00:54:57
KW 2000A ssb transceiver - general view showing its separate PSU + loudspeaker ass'y., etc.

Submitted by Skywave, Aug. 30, 2014.
admin - Sunday, August 31, 2014 at 00:53:17
KW 2000A ssb transceiver - front view.

Submitted by Skywave, Aug. 30, 2014
admin - Wednesday, August 27, 2014 at 13:52:44
Rohde & Schwarz SWOB - POLYSKOP 1.

Most people will have heard - or have previously seen - one of these, even if ownership amongst radio enthusiasts is a bit thin on the ground! Of all the test instruments that R & S produced, the SWOB is probably THE one item that springs to mind when you hear the names "Rohde & Schwarz".

I describe it as frequency-response measuring instrument. The resultant display is freq. on the X-axis; amplitude on the Y-axis. The sweep freq. goes up to the GHz region and has a very wide display bandwidth. This makes it the perfect instrument for tasks such as aligning wide bandwidth filters, e.g. the 40 MHz BPF in a Racal RA-17 comms. receiver. I used one of these on a regular basis back in the early 1970s when I was involved in the design of VHF log-periodic antennas and later, when repairing Racal RA-17s.

Apart from the 'language problem' - which is soon overcome with familiarity through regular use - the two drawbacks are the weight of this item (in excess of 70 lbs.) and the acquisition cost, if you want to buy a second-hand one. Often they come with a floor-mounted trolley - and that makes this item a lot easier to move around!
Superb piece of kit though - and internally, built like a battleship - as you would expect from R & S.

R & S subsequently produced a SWOB-2 and a SWOB-3: the latter is all semiconductor (or so I am led to believe).

Submitted by Skywave: Aug. 27, 2014. //
admin - Wednesday, August 27, 2014 at 13:29:59
R und S KARU C-meßgerat:
Rohde and Schwarz Capacitance measuring unit.

Internally, built like a battleship - as you would expect from R & S! I'm unsure about the provenance of this item, but it probably dates from the mid-1960s. And the interior is almost pristine. Unfortunately, the front cover is missing, but that does not impede its use.
The range switch operates a large and complicated rotary switch inside the case and that mechanism is coupled to a rotating drum, where the linear calibration scale is rather reminiscent of the Marconi CR-100 comms receiver.
Two valves: one 6SN7GT and one 6H6 plus a selenium rectifier. Each capacitance range has its own individual cylindrical ferrite coil, with adjustable slug for calibration.

The only downside to R & S kit is that it is a great help to be able to read - and understand - the German language, but with this item, since its front panel controls are almost self-evident as to their function, any inability with the language is not a serious problem.

Submitted by Skywave, Aug. 27, 2014 //
admin - Thursday, August 7, 2014 at 23:44:38
All semiconductor HT PSU
admin - Thursday, August 7, 2014 at 23:43:36
All semiconductor HT PSU.
Photo 5 of 5 : control board.
admin - Thursday, August 7, 2014 at 23:42:53
All semiconductor HT PSU.
Photo. 4 of 5.
admin - Thursday, August 7, 2014 at 23:42:05
All semiconductor HT PSU.
Photo 3 of 5: inside photo #1

This photo. shows various safety covers that have been fitted over points of high voltage.