Editing FR Electronics RSM 82-1A

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{{Infobox dswitch
| image name        = FR Electronics RSM 82-1A -- infobox.jpg
| manufacturer      = [[FR Electronics]]
| product code      = 
| product name      = 
| introduced        = 
| sense type        = [[Reed]]
| switch type       = [[Linear]]
| actuation force   = 
| family            = 
}}

'''FR Electronics RSM 82-1A''' is a reed switch, using a design very similar to [[Unitra Dolam M-24-112]].

==Description==
The base of the switch has six holes for terminals: four for two reed modules (likely providing DPST rather than double-action) and two for illumination which line up with channels in the centre shaft that hold a lamp. An FR-branded illuminated version has never been seen, but the [[RRE]] illuminated counterpart is [[RRE RKS 80-1AL]].

"1A" likely indicates 1 form A (SPST NO); whether "RSM" or "RSM 82" indicates the name of the series remains unknown. The DPST version is presumably RSM 82-2A.

===Series===
The identity of the series is not known. Racal used RSM 83-1A for the front panel of the RA1792 radio receiver;<ref>Yahoo Groups — [https://groups.yahoo.com/neo/groups/racal6790gm/conversations/messages/1959 Racal 6790/GM]</ref> this is a heavier switch than RSM 82-1A. Additional part numbers exist with the "RSM" prefix; related part numbers appear to include RSM62-1A, RSM62-1AL (using a 28 V lamp), RSM82-1A, RSM82-2AX and RSM83-1A. Whether RSM 6x and RSM 8x are the same or separate series cannot be determined.<ref>ICLocator.com — [http://ic-r.iclocator.com/switches-skus-R-RSM02A15_RSP4X2-7C9.html Switches RSM02A15, RSM02A15-70, RSM02-A-50Y, RSM621A, RSM62-1A, RSM62-1AL, …]</ref> Note that an "L" suffix for a lamp applies to these part numbers also.

==Disassembly==
The base of the switch can be removed by prying open the switch using a thin blade.

The reed unit terminals appear to push into the base of the switch from the outside, making the reed assembly non-removable. The reed capsule itself is attached to the terminals using a seemingly invisible amount of solder, or some other visually non-detectable process.

==Keyboards==
*Plessey Displays keyboard, ca. 1984<ref name="Plessey" />

==Gallery==
<gallery widths=250 heights=187>
File:FR-RRE reed switch comparison.jpg                         | Comparison with FR Electronics RSM 82-1A
File:FR Electronics RSM 82-1A -- opened.jpg                    | Opened
File:FR Electronics RSM 82-1A -- spring and slider removed.jpg | Spring and slider removed
</gallery>

==References==
<references>
<ref name="Plessey">Deskthority — [https://deskthority.net/keyboards-f2/plessey-displays-qwerty-kb-t14625.html {{sq|1988}}PLESSEY DISPLAYS QWERTY KB{{sq|FR Electronics(RS?) reed switch}}]</ref>
</references>

[[Category:FR Electronics switches]]
[[Category:Reed switches]]
[[Category:Linear switches]]
[[Category:List of all keyboard switches]]