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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.
Side by side with different types of antennas intended for broadcasting in Russian and Western FM bands we also produces:
- transformers 50/75 Ohm,
- clummy loads up to 5 KW,
- coaxial power dividers,
- direct and angular connectors and also HF male and female connectors for coaxial cables of different types with outer diameter up to 3 1/8".
For extra data about technical characteristics and terms of delivery of the above eguipment please use our contact information.

 

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.
We produce and operated successful different types of modern, manufacturabile coaxial power dividers from CPD 1/2 to CPD 1/16 with given value of input/output resistance (as illustrated in pictures below).
Maximum power of coaxial power dividers can vary from 1 W to 50 kW.
Construction of coaxial power dividers input and outputs is in accordance with allowable power and for customer order.

Main features of CPD

Type
Freq.range
VSWR
Dimensions
Weight
Climatic
conditions
Price
-
MHz
-
Mm
Kg
$ US
CPD
1/2
66-74
1.05
1200õ180õ180
24
±50
1000-1500
87.5-108
1.05
950õ180õ180
15
±50
1000-1500
450-900
1.05
350õ120õ90
6
±50
500
CPD
1/4
66-74
1.05
1200õ250õ180
30
±50
1100-1600
87.5-108
1.05
950õ280õ280
20
±50
1100-1600
450-900
1.05
350õ120õ90
7
±50
800
CPD
1/8
66-74
1.05
1200õ350õ200
35
±50
1200-1800
87.5-108
1.07
950õ350õ180
25
±50
1200-1800
450-900
1.06
450õ130õ130
8
±50
1200
CPD
1/16
66-74
1.06
1700õ170õ170
50
±50
1400-2000
87.5-108
1.07
1400õ170õ170
35
±50
1300-200
UHF IV/V
1.06
450õ150õ150
10
±50
1600

* - 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.

Fig. 1

 

Fig. 2

 

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.
The orders for CPD realize within two, three months (in accordance with type of CDP) after signing the Purchase Order.

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:

  - delivered power   10 KW;
  - working frequency band   65- 75 Mg or 87.5-108 Mg;
  - input/output resistance   50 ;
  - joined flanges   1 5/8';
  - CPD in band   1,1;
  - control voltage   28 V (DC);
  - control current (max)   13 À.;
  - switch time no more   50 ìsec;
  - source   50000 switches (with disregarding real quantity of switches about 500 years exploitation);
  - mass, kg. no more   22 kg;
  - price   3000 $

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.
For control switches 2õ2 are used the scheme of control, being realized the required operation è reliability of commutation, and also mnemonic circuit which shows all high frequency switchboard connection.

     
 
Figure. 1
  
Figure. 2
  

 

New power 16-way 180? divider was developed
for TV antenna system in UHF band.

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.

Photo 1

 

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.

Photo 2

 

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.

Keys :

•  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.

 

Electrical characteristics

Nominal wave impedance of input – 75 ohm.

SWR within the range 490-640 MHz – not above 1.07.

Maximum peak power – 30 kW.

Notice

It is possible to change the band center, broaden the bandwidth and turn transformation coefficient on the customer's request.