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Philips / Magnavox,
Philips Gloeilampenfabrieken, NL-Eindhoven

D - 2935

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überarbeitet am 22.10.2010

In the mid eighties, after Sony had brought out their first microprocessor controlled portable shortwave receiver, Philips presented two microprocessor controlled receivers: The D-2935 portable and the D-2999 desktop shortwave receiver - these two sets were the only Philips consumer grade shortwave radios to rival the Sony, Panasonic and Grundig sets. They came with a "Guide to Shortwave listening" user's manual and a useful frequency list.
After this success, Philips only developed only simple travel portable sets without too many ambitions on the shortwave radio market.

Double conversion, I.F. 55 MHz, 468 kHz, FM: Single conversion 10,7 MHz

Digital display, 1 kHz

146 - 29'999 kHz (version /02 for Germany only up to 26'100 kHz), 87,5 - 108 MHz

AM, SSB (BFO), FM

Selectivity -6 dB/ -90 dB
6,3 / 19 kHz, updated Version 2,7 / -- kHz

Sensitivity

Attenuator -20dB, BFO, tone control
frequency keypad, 9 memories

The Philips D-2935 is a medium sized travel radio, with it's dimensions of 32 x 18 x 8 cm it has the dimensions of a languagwe dictionnary - to operate the keys, the set has to held with the the other land to prevent the set to fall on it's back. The D-2935 comes with a carrying strap, it has a net weight of 3,18 kg and with the six UM-1 batteries and the additional three UM-3 batteries to power the radios microprocessor and to keep memory content und the time of the clock, the weight is increased to 3,8 kg.
The receiver can be powered from 9 - 14 Volts DC and has an integrated mains power supply switchable between 110 and 220 Volts AC.

The main power switch and the switch for the display illumination are located in the left upper corner of the frontpanel, just above the big speaker.
The tuning indicator active in the AM bands only is a five step LED chain not calibrated to S-units; just below, You find the backlit LCD frequency display with a resolution of 1 kHz, the waveband and the shortwave meter band are also indicated.
Just below, You find the six buttons for the frequency memories, You can combine the buttons A-1, A-2, A-3, B-1, B-2,... C-3 to store a maximum of nine frequencies. Further down, the frequency band pushbuttons are located.
At the right, You find the direct frequency entry keypad and just below the main tuning stop, the frequency is increased from 1 to 10 kHz per step when the knob is turned fast.

In the right upper corner, three tiny swtiches are used to switch from internal telescopic and ferrite antenna, to activate the attenuator (position 'local') and the BFO for reception of CW and single sideband transmissions.
In the row of rotary controls below, You find the BFO control, the R.F. gain control marked 'AM Gain Control', the tone control and the slightly bigger volume control. All these rotary controls work without problems even after years, what a contrast to the sliding controls.

At the left face of the cabinet, You find the 'Line out'and the earphones jacks and the 12V DC and mains connectors.
At the right small face, You find the coaxial connectors for the Am and FM aerials and a tiny switch to select the internal and external antennas.

The Philips D-2935 is a microprocessor controlled double conversion receiver with a high first intermediate frequency of 55 MHz, the mixer signal of 55,164 - 84,999 kHz derives from a high stability PLL synthesizer. The signal is led to the second mixer through a crystal filter, the 468 kHz second intermediate frequency has to pass a ceramic filter and is lead to the demodulator. A BFO gives the possibility of CW and SSB reception.
The set comes without an active preselection so the use of an external preselector or antenna tuner might be helpful when You consider to operate the reciver on long wire antennas.
In the early version, the I.F. filter has been to wide to separate two stations with 5 kHz channel spacing with it's width of 6,3 kHz at -6dB, in the 'updated' version, it has been replaced by a much better filter with a width of 2,7 kHz at -6 dB.

In practical use, the D-2935 is a good performer when You intend to listen to the signals of the major international shortwave broadcasters, especially when You own the later version with the improved narrow I.F. filter. In the amateur radio bands, some strong CW ans SSB signals of nearby ham can be copied easily, You have to operate the BFO control quite carefully.
To tune in to a station on a known refrequency, use the Band Selection key to select the waveband, the shortwave button takes You to the 120 meters shortwave band and jumps to the next international shortwave band, when You press the SW button again. When You have reched the desired band, use the Main Tuning knob.
For direct keypad frequency entry, key in the desired frequency without leading zeros, with 6 0 7 5 Exec, You will jump to 6075 kHz and You will hear the Deutsche Welle from Cologne from the speaker. With 6 . 0 7 5 Exec You will jump to the same frequency, too. Digits up to 2 6 . will be interpreted as MHz frequencies on shorztwaves, numbers higher then 8 8 . will be interpreted as MHz in the VHF FM band, You don't have to press another button to switch to the FM band
When a station is tuned in, use the STORE button followed by a memory channel designation to store the frequency in the respective frequency channel, e.g. A - 2. Press the same buttons A - 2 again, to call the frequency from the reveier's memory.
The D-2935 makes good use of all the possibilities of microprocessor control and operation is quite intuitive - even without a user's manual.

In summary: the D-2935 is a quite rare set in online auctions and on the used receiver market: The set is not that portable, but it has a good audio and reasonable good performance on the shortwave broadcast bands. It has only mediocre performance for CW and SSB reception, but is a very useful set the enter the shortwave hobby.

weitere Lektüre:
d: Mit Folientastatur:Philips D 2935, Nils Schiffhauer, funk 12 / 86
e: Philips D-2935, WRTH receiver tests 1987, Jonathan Marks

© Martin Bösch, 3.10.2010