I don't remember who I bought this receiver from, but it was part of a package deal,
and came with an ITT/Mackay 3020A and
a RACAL 6217E.
The 6217E is a rack-mount HF receiver, 10 KHz to 30 MHz, based on the RACAL 17, but solid state and modularized to a very definite fault. It is only 2 rack units high, and a great deal of ingenuity has been exercised to pack so very much into such a tiny volume.
It's a shame that it's so hard to work on, as mine is pretty deaf. Other folks with various models of 6217 (the "E" means that it has a 100 KHz IF, or some such special feature) tell me that theirs are pretty deaf, too.
More on the 6217E in its own proper place. Someday.
The DEBEG 2000 covers 10 KHz to 29.9999 MHz, in 100 Hz steps.
Anyway, from what I've been able to find (Osterman and other sources), DEBEG was a German company that got borged by Siemens. The company got pretty well absorbed, and by now those DEBEG personnel that weren't let go at the merger have retired or died, or are otherwise unavailable.
The address in my installation and operation manual is:
2000 Hamburg 50
Post Fach 50 03 29
nd the date on the manual is March 1981.
Parts also are pretty much unavailable, ditto extender cards and the like. It's a good thing that it was built of COTS parts, except for the cards themselves. As you can see from the cards, there's nothing fancy about them at all. In fact, I'd have to call them "primitive", even by the standards of the mid-1960s, when I got started in electronics.
It appears that the DEBEG 2000 was designed as a shipboard receiver. It's one of the very earliest computer-controlled receivers, driven by an Intel 8080 and with something like 100 memories. It has variable tuning rate, USB/LSB/CW/AM/FM modes (labeled with their old ITU/FCC names: A1, A2H/A3H, A3A/A3J, and F1), keypad frequency entry, and buttons to tune directly to the 500 KHz or 2182 KHz distress frequencies with one push of the button.
|The manual for the DEBEG 2000 can be seen at the links below:|
|Revisions, Contents, Section 1: General Information and Specifications, Section 2: Installation (5.1 MBytes)||Section 3: Operation (3.9 MBytes)|
|Section 4: Principles of Operation (10 MBytes)||Section 5: Maintenance (with parts location diagrams) (5.4M MBytes)|
|Power supply and power filter boards (1.6 MBytes)|
|This is what the receiver looks like from the front. Note the speaker on the left, with fuses for 115VAC and 12VDC operation immediately below, and a LED to show when the receiver is on 12VDC power. Below those are a headphone jack and a switch to enable or disable the speaker.||
From the left, the second cluster of controls is the keypad, which is used for direct entry of frequencies
or for immediate 1-touch tuning to the 500 KHz or 2182 KHz distress frequencies. Below that
are a dimmer for the front panel illumination and an audio volume control.
|The third control cluster has the LED frequency display at the top, the RCL, FREQ, SCAN, and STO buttons in a horizontal row immediately below, and the CLR, PRES, SC/ON. and REM buttons in the bottom row.||
Below the buttons are three rotary controls: Sensitivity, which adjusts IF gain; Clarifier, which
in A2H, A3J, and F1 modes, fine tunes the receiver about 150 Hz from the indicated frequency, and
in A1 mode, adjusts the BFO frequency over a range of about 1.5 KHz; and Preselector, which tunes the
preselector if it is enabled. If the preselector is enabled, the indicator above and right of the
control lights. Pulling the Sensitivity knob outward disables AGC.
The fourth control cluster is the S-meter and tuning knob. The S-meter gives a relative indication
of signal strength when AGC is enabled, and is not meaningful when AGC is disabled. The tuning knob
tunes the receiver up or down at a variable rate, depending on how far the knob is turned from its
center position to the left (down) or right (up). The knob is spring-loaded and returns to center
(no tuning change) when released. The minimum rate is 1 increment per second, and the maximum is
about 60 increments per second. The increment is 100 Hz unless mode A2H and wide bandwidth
are selected, in which case the increment is 1 KHz.
The rightmost control cluster is two vertical columns of buttons.
The left column selects Very Narrow (VN: 300 Hz), Narrow (N: 1 KHz),
Intermediate (I: 2.4 KHz in mode A1 or A2H, USB bandwidth in mode A3J,
Telex bandwidth if mode F1 is selected and the optional telex filter is
installed, or 2.4 KHz if mode F1 is selected and the optional telex filter
is not installed), and Wide (W: 5.4 KHz) bandwidth.
The right column selects mode of reception: CW (A1), AM (A2F/A3H), USB (A3A/A3J), or FSK (F1).
There appears to be no provision for receiving LSB signals with this receiver; it may be possible to do so using the A1 mode, proper tuning, and careful adjustment of the BFO.
This is what the receiver looks like from above, with the top cover and the shielding over the compartments for cards 1 and 2 removed.
I suspect that most, if not all, of the compartments had similar shields when the receiver was new.
The leftmost compartment is the power supply. Boards are as follows:
||There are two boards behind and parallel to the front panel. The rearmost one is the microprocessor board; the one between it and the front panel is the display board.|
Board 1, component side
|Board 1 is the RF filter board. The microprocessor enables one of 9 filters by turning on a selected pair of diodes.|
Board 2, component side
|Board 2 is the preselector board. Antenna input goes into a power limiter, then to wideband and duplex
filters or one of three MF/HF preselectors. The MF/HF preselectors are tuned by voltage applied to varicap arrays.
A subassembly on the preselector board is the first mixer board. THis is a double balanced mixer which receives the 10 KHz to 30 MHz RF input through a VHF lowpass filter and the 38-68 MHz local oscillator (LO) input through a second VHF lowpass filter. Mixer output is amplified by a low noise transistor and then goes to the 38 MHz IF board, which is Board 3.
Board 3, component side
|Board 3 is the 38 MHz IF board. The 38 MHz IF signal passes through a crystal filter, a PIN diode attenuator, a grounded gate amplifier, and then to one input of a double balanced mixer. The other input of the double balanced mixer is driven by a balanced modulator, which has 38.6 MHz LO as one input and a 3 MHz VCO (clarifier) as the other input. This enables the second LO to be varied slightly in frequency by the clarifier control.|
Board 4, component side
|Board 4 is the 1.4 MHz IF filter board. One of three filters is selected by digital data from the microprocessor board. The 1.4 MHz IF also is transformer-coupled to the IF output hack on the rear panel of the receiver.|
Board 5, component side
|Board 5 is the 1.4 MHz second IF and demodulator board. Input at 1.4 MHz is applied
to a product detector; the second input to the product detector is the 1.4 MHz second LO signal.
Detector output passes through a low pass filter and then to a line amplifier and the speaker amplifier. Output from the AM detector also is applied to the input of the AGC circuit.
Board 6, component side
|Board 6 is the VCO board, one of four boards that make up the frequency synthesizer. VCO1, on the VCO board, covers 38.0085 to 67.9999 MHz in wo bands with two separate VCOs (VCO1a and VCO1b) sharing a common output amplifier. VCO1a operates below 52 MHz, and VCO1b from 52.0 MHz to 67.9999 MHz.|
Board 7, component side
|Board 7 is the divide-by-20 board, part of the synthesizer. It divides the output frequency of VCO1 by 20. The output of this divider is input to phase-locked loop 1, which has output frequencies from 38.0085 to 67.9999 MHz in 100 Hz steps.|
Board 8, component side
|Board 8 is the programmable divider board, part of the synthesizer. This board contains VCO2, which operates from 90.001 to 100.00 MHz in .0001 MHz steps. It also contains two programmable dividers, N1 and N2. All these are used in the synthesizer, and synthesizer loop 2 (VCO2, divide-by-N2, and phase detector 2) is all on this board.|
Board 9, component side
|Board 9 is the reference board, part of the synthesizer. This board contains a 11.2 MHz temperature-compensated crystal oscillator (TCXO) and a fixed frequency divider chain to produce 1.4 MHz LO2 and the 50 KHz and 1 KHz reference frequencies for the two phase locked loops in the synthesizer. It also contains the BFO circuit, which supplies a variable 1.4 MHZ local carrier when the receiver is in CW (A1) mode.|