TR1998 part1. VHF AM Aircraft radio from the Cold war period?

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May be wrong but I believe that TR1998 was a later Military version of the TR1985, TR1986 and TR1987 radios, these a version of the STR.9-X series of commercial radios available for aircraft communications by Standard Telephones and Cables.
The 1985 covered 100 to 125 MHz.
The 1986 covered 124.5 to 156 MHz.
The 1987 covered 115 to 145 MHz and was used by the Navy.
and the 1998 covered 100 to 156 MHz. So both ranges of the 1985, 1986.
The STR.9-X series manual is available on the Internet.
I think it was used in the cold war era, if you have information please post in the comments.

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13 сен 2024

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Комментарии : 4

@winniewotsit4452 10 месяцев назад

I recall working with the TR1985/6 sets back in early 1960's, which were very similar to the unit you show here. Most RAF aircraft employed such units, though they were being replaced with more modern equipment by time I left the mob in 1967. I only had experience of first line maintenance on these sets. It often involved tweaking the tuning or changing the xtal pattern, You simply had to plug into the intercom, fire up the set, release the lock on the tuning knobs and tune for max noise on the RX side, then max brightness on a light bulb poked into the aerial socket for the Tx side. As to the channel change clutch. The sets I worked would always momentarily engage the channel change section when you switched the power off. So the clutch solenoid on the earlier sets must have been wired differently. Good to see these old bits of kit though, so thanks for doing the video. PS The ubiquitous EF91 or should I say CV138?

@ef91valve 10 месяцев назад

Thanks for the comment, my set also moves the channel change on switch off, I guess just down to the switches. I have assumed the TR1998 was to replace the 85/86 units as it would cover both bands in one so possibly saved stock holding and manufacturing costs with one rather than two units, but as I said just a guess.

@migsvensurfing6310 10 месяцев назад

Interresting. Quite an effort they madde to build this.

@ef91valve 10 месяцев назад

I guess from an era where the known technology was not small, it was easier to fabricate the chassis then build PCB's and modular sections meant easier maintenance.