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R-105D, R-108D, R-109D and R-114D
are optically and technically alike, differ only by frequency range. They strongly resemble the German backpacks of WW II.
R-105 D (R-108d, R-109 D) is a portable or mobile set. Operating mode is F3, simplex. It can be operated by remote control and used at relay operation. ("It can be dipped 0.5 m under water for 3 minutes"...)
R-105, R-108, R-109
A note from Ted, DJ3YR, (Thank you, Ted!):
It is largely unknown that there was a pre-series, called
"R-105, R-108 und R-109" (without the additive "D").
This model had one more tube in the IF- stage. (tube 11). Apparently there were problems with this stage, so that in the final version this double diode was replaced by a semiconductor diode pair.
The old versions were "updatet", by replacing the IF- stage with the new version. While clearing up a workstation of the former GST in Thuringia, large packagings of brand new IF stages were found in a container. They apparently were meant to modernize the old R-105,-108,-109.
The optical difference is the missing switch for the operational mode on the front panel.
The old versions have a lock for the tuning knob, where the later versions have the switch for the operational mode.
(At the later "D"- versions this lock switch is situated on the right side of the glass lens.)
The above pictures of the chassis and the schematics are taken from the manual for the "R-109" "DV-44/19" (1958) of the former "NVA"; where detailed descriptions can be found.
Batteries and cells of the Warsaw Pact