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Manpack Radio Grinel TR28B2 TRA967/1

Manpack Radio Grinel TR28B2 TRA967/1; Racal Engineering (ID = 1697858) Military Manpack Radio Grinel TR28B2 TRA967/1; Racal Engineering (ID = 1697859) Military
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Manpack Radio Grinel TR28B2 TRA967/1; Racal Engineering (ID = 1697858) Military
Racal Engineering: Manpack Radio Grinel TR28B2 TRA967/1 [Military] ID = 1697858 933x802
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For model Manpack Radio Grinel TR28B2 TRA967/1, Racal Engineering (Racal Instruments) Ltd., Bracknell:
By courtesy of guest Nico Oelofse, South Africa.
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Racal Engineering (Racal Instruments) Ltd., Bracknell
Year: 1978 ?? Category: Military Equipment (not Re, Tr or RXT)
Semiconductors (the count is only for transistors) Semiconductors present.
Main principle Superheterodyne (common)
Wave bands Short Wave (SW only)
Details
Power type and voltage Storage Battery for all (e.g. for car radios and amateur radios) / 12 / 24 Volt
Loudspeaker - For headphones or amp.
Power out
from Radiomuseum.org Model: Manpack Radio Grinel TR28B2 TRA967/1 - Racal Engineering Racal
Material Metal case
Notes

This is originally a RACAL TR28, later TR28B2. We don't know for this model, if it is made by Racal and branded by others or made by others with some special agreement.
Here we show yet only data which we assume by the pictures.


 

External source of data Nico Oelofse, South Africa

Model page created by Ernst Erb. See "Data change" for further contributors.



All listed radios etc. from Racal Engineering (Racal Instruments) Ltd., Bracknell
Here you find 107 models, 54 with images and 12 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


 


Forum contributions about this model
Racal Engineering: Manpack Radio Grinel TR28B2 TRA967/1
Threads: 1 | Posts: 2
Hits: 129     Replies: 1
racal: Racal TR-28 backpack/manpack shortwave military radio
Jose Mesquita
18.Jul.21
  1

I worked at "CONRAD Construtora Radio Electrica, Lda" in Lorenzo Marques (currently Maputo) in Mozambique as a telecommunications engineer servicing RACAL and STORNO communication equipments. I maintained these RACAL TR-28 radios, among several other models, starting at 1974, but the Portuguese military forces used them well before that.

 

As far as I knoww, RACAL UK had no direct action on the developing the RACAL Electronics South Africa TR-28, as RACAL UK left South Africa well before the RACAL Electronics S.A.engineers have designed this TR-28 backpack/manpack transmitter/receiver oriented to militaty forces in the southern Africa region.

There are plenty of information in the Internet in portuguese language if you look for "RACAL TR-28 Portugal", or try "RACAL TR-28 Ken Clayton" for mostly in English pages.

The famous Ken Clayton was one member of the RACAL Electronics S.A. design team back in the 60's.

Several model iterations were designed, including custom versions for specific military forces on several countries.

 

The RACAL TR-28 ​(Transmitter-Receiver 28) was used by several southern Africa countries, among the South African and Portuguese military forces, starting in mid 60's.

There were several TR-28 iterations (at least 5 of them, even custom versions for different military forces), but the base design was the same, where the original TR-28 was designed and put into production in 1966, by South African designers working for RACAL Electronics S.A..

RACAL (on AM/SSB SW bands) and STORNO (on VHF and UHF professional bands) were also used by civil organizations in remote zones at the farms where there were no telephone land lines and at a time when commercial mobile phones were not yet invented.

During the Portuguese administration (up to 1975) of Mozambique, RACAL Electronics S.A. was marketed in Portugal by "CONRAD - Construtora Radio Electrica, Lda" based in Mozambique, and even assembled in a few Portuguese manufacturing plants, distributed between Portuguese colonies and Portugal Europe, under license of RACAL Electronics S.A..

The TR-28 was designed in South Africa, as the RACAL UK had left S.A., and the design engineer was Ken Clayton (among others in the team). The TR-28 is seen as a evolution of the older RT-14B equipment made by RACAL SMD (look for it in Internet).

The TR-28 was also assembled in Portugal (Europe) at "Standard Electrica" manufacturing plant  where the components were imported from South Africa by Mozambique CONRAD company. CONRAD also assembled these radios for some time as well in their manufacturing plant, along with National consumer radios assembled under Panasonic license. 

The original TR-28 model initial production batch was delivered to Rhodesia military forces in 1967, followed by South African and Portuguese military forces.

 

The TR-28 series operates on HF AM/SSB for voice and morse, from 2 to 8 MHz (selectable channels  frequencies by installing sets of crystals) at a maximum transmitter power of around 25 Watt (SSB). The removable 12VDC NiCd battery pack (10 x 1.2V "D" size cells) was part of the radio enclosure, attached to the main unit by clamps. The battery pack could be recharging while the radio was being used by connecting it to the car electrical system. Various antenna types were designed including a whip  to use the radio while walking.

The later TR-28 versions featuring up to 36 channels were developed with the Portuguese cooperation (Standard Electrica and military forces) to RACAL South Africa. The later portuguese version had the label "Exercito Portugues" stamped on the front.

A popular civil version used by farmers in Mozambique and Angola under Portuguese administration and other southern countries was the RACAL TR-38(D). It was a TR-28 but using a less robust enclosure, powered from the car batteries and a fixed car whip antenna if installed in a car, or it could be used as a tabletop radio at home.

More powerful 100 Watt car mobile versions were designed, like the RACAL TR-422 series, where the transmitter output stage used two 6146 tretode valves (if my memory serves me well). An sophisticated office tabletop version was also designed, the RACAL TR-15, with 100 Watt but using only transistors, where one model variant, the RACAL TR-15S, used a synthesizer for much more flexibility operation.

 

Jose Mesquita
18.Jul.21
  2

Racal Electronics South Africa, Limited advertizing The TR-28, TR-38, RT-422, and TR-15.

 

 

 

A publicly available article covering the history of Racal TR-28 series radios designed and manufactured in South Africa by Racal Electronics S.A.:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
Racal Engineering: Manpack Radio Grinel TR28B2 TRA967/1
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