CZK - RTL22 (letecká rádiostanica)

Used sa aj in civilných lietadlách with iným frekvenčným krokom (25 kHz).

Range: 100 - 150 MHz
Modulácia: AM
Citlivosť: 5 uV
Performance: min 4 W
Napájanie: 28V jednosmerných

Source own zbierka.

I would like to point out the errors in the above description of the RTL22 radio station.The RTL 22 radio station was built sometime in the late 50's and early 60's in cooperation between Tesla Kolín (TE-KO) and the AS Popova Praha research institute (VÚST).It was the first domestic radio station produced in TE-KO, before it was produced the licensed RSIU-3M. In the years 63-65, the RTL 22 was turned into the RTL11, again in cooperation with VÚST, by developing a frequency control panel (side C) and a new control box with mechanical memory. This eliminated the need to use exchangeable crystals. And now for the errors – the correct parameters are given below, the station could never have a channel spacing of 25 KHz. It is not true that the RTL 22 station is a more modern version of the RTL 11 station, it is the other way around.The picture rtl22.jpg does not show the RTL 22, but an incomplete RTL 11 set.The block above is the very block C mentioned.
So far I have not managed to get a decent photo of the set, so for now I am showing at least a photo of the control box. This is the essential part that makes it different from the RTL11, the other blocks are identical, see post on RTL11.




Brief description.


RTL 22 is an airborne radio for the frequency band 100 to 150 MHz. Up to 1000 channels with 50kHz spacing could be used in this band, but only 35 of the 1000 could be used in the aircraft. The frequencies of the channels were determined by switching crystals in the control box carousel, where the main oscillator was located.At the same time as the crystals were switched, the contacts were operated by adjustable pins, which switched the taps on the winding resistor. The resistor was part of the bridge of the tuning servo-system, and its powerful element-servo-motor with gearbox set the tuning units of the receiver and transmitter to the desired position. The 50kHz channel spacing of the station was difficult to meet at the time of its creation; it was difficult to achieve frequency stability of the main oscillator over a 110 degree operating temperature range, and selectivity was insufficient without the use of focused selectivity filters or crystal filters. Therefore, the station was fitted with crystals with frequencies guaranteeing the 83.333kHz channel spacing used in the Air Force. It operated in „two-way simplex operation on the same frequency“. The receiver sensitivity was min. 3.5 uV, the transmitter had min. 5W power. The station had a main and a backup on-board phone for two pilots and allowed the pilots to receive, transmit, listen to the radio compass, communicate with each other using the on-board phone and the backup on-board phone, control the volume, but only one could select the frequency, turn on or off the silencer and turn on the backup on-board phone.When the phone was in operation, the receiver was listening in the background. The backup on-board phone had an independent power supply, once switched on it took priority over everything. Dangerous altitude, dangerous acceleration and MARKER signals were introduced to the phones. It was powered from the aircraft's 27V +10%-10% on-board mains. The operating temperature range was from –60 to +50 degrees.Within this temperature range, all station parameters were guaranteed.



RTL22 kit:


Block A : contains receiver and transmitter (identical to RTL 11 Block A)


Block B : power supplies, RF circuits (identical to RTL 11 Block B)


Block Ov : contains main oscillator, controls, fully populated carousel of max. 35 crystals.


ZM block : on-board telephones and nf circuits (identical to ZM block RTL 11)


Block U : subscriber box and co-pilot controls.


Antenna + antenna cabling. (identical to RTL 11 antenna)


Common spare parts


Crystal sets


Cables