At its own enterprise the Octode Ltd produces different equipment and elements of HF antenna-feeder parts. Most of them are made in accordance with the technical documentation worked out by its specialists and supplied to many Russian cities.
COAXIAL POWER DIVIDERS
Coaxial power dividers (CPD 1/N, N - the number of outputs) are used in broadcast and TV stations with multi-radiator antennas.
Main features of CPD
* - indicated difference between prices corresponds construction CPD for minimum and maximum allowable power.
Variants of multi-radiator antenna are on the Fig. 1 and Fig. 2. Fig. 1 gives traditionally flowchart of multi-radiator antenna with 16 radiators and customary CPD. Fig. 2 gives flowchart of multi-radiator antenna with 16 radiators and CPD Octode LTD production.
As is easy to see practical use of CPD Octode Ltd production result in considerable economy (six CPD, twelve sections, great quantity of power cable), decrease of elements' quantity and increases the reliability in service.
Picture 1. CPD 1/ 8, band 450-900 MHz.
Picture 2. CPD 1/ 3, band 87.5-108 MHz.
Picture 3. CPD 1/ 16, band 66-74 MHz.
ORIGINAL HIGH FREQUENCY SWITCH FOR MODERN RADIO ENTERPRISES
We have worked out, produced and operated successfully the remote control switch 2x2 for broadcasting transmitters on based vacuum switch 1x2, which has the following parameters:
Construction of high frequency switch 2õ2 (Fig.1) should build on its based high frequency switchboard with the possibility of gradual increase of quantity high frequency switches without deterioration of co-ordination in high frequency route. Version of high frequency switch, which are operated in Octode Ltd, is on the Figure 2.
New power 16-way 180? divider was developed
The new power 16-way 180? divider for TV transmitting antenna system in UHF band was developed and manufactured by order of Krasnodar Regional Broadcasting Station. The design is protected by patent and its high electrical characteristic and small dimensions are second to none.
The new power 16-way 180? divider is used for connection to power HF75-120-D cable with large cross dimension and wave impedance 75 ohm. The peculiarity of the divider is that input impedance is 75 ohm and 16 ways are 50 ohm. Therefore the real input impedance to output impedance ratio is 24.
The new power 16-way 180? divider for TV transmitting antenna system in UHF band is a power distributor of in-phase - antiphase type. All the outputs are structurally and electrically divided in two groups of 8 outputs that are marked with different colors. Herewith the output signals of each group have equal amplitude and phase. The signals of both groups are antiphase among each other in the working frequency range.
It is important to take this fact into account for correct phasing of the antennas that are fed by this divider. The input of the new power 16-way 180 ? divider has flanged connector for HF75-120- D cable and 16 EIA 7/8” outputs.
The overall view of the new power 16-way 180 ? divider is shown on Photo 1.
Input for cable HF75-120- D.
The upper group of 8 outputs with relative phase 0 degrees.
Lower group of outputs with relative phase 180 degrees.
Nominal wave impedance of input – 75 ohm.
SWR within the range 490-640 MHz – not above 1.07.
Maximum peak power – 30 kW.
It is possible to change the band center, broaden the bandwidth and turn transformation coefficient on the customer's request.