Dow Key relays ?
d.buska at AAIATE.COM
Wed May 7 19:06:15 EDT 1997
Dow-Key is still very muck alive. They go by the name Dow-Key
Microwave these days. Many of those same relays we used as hams in
the 50's and 60's are still available from them today.
On Wed, 7 May 1997 16:01:47 -0500, Nick England wrote:
>One of the reason's to pick up an older ARRL Handbook from the
>or early 60's is that there are lots of interesting and
>advertisements in the back.
>Anyway, Dow Key was a very successful manufacturer of antenna T/R
>for ham gear in the era of separate receivers and transmitters.
>were co-axial relays with little effect on SWR and were rated for
>kilowatt or more. They weren't particularly fast (no QSK) but they
>did make a satisfying ker-chunk when switching. Most often, hams
>have a Dow-Key relay with a 115 vac coil (because most
>had connections to supply 115 vac when switched to "transmit") and
>set of auxillary contacts to mute your receiver while
>They pretty much disapppeared when SSB, VOX, and transceivers
>on the scene.
>By the way, for QSK operation, hams usually had an electronic T/R
>switch using a tube to clamp the receiver input when transmitter
>input was present. Dow-Key made one of these too, but Johnson was
>probably the most popular commercial unit. They weren't hard to
>73 & Have Fun,
>Nick England KD4CPL nick at cs.unc.edu Univ. Of North Carolina
>http://www.cs.unc.edu/~nick Chapel Hill NC
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