[Collins] KWM-2 antenna relay wanted.

[Dr. Gerald N. Johnson]

On Fri, 2006-11-03 at 19:58 +1300, Dave Brown wrote:
> Tks for suggestions etc.
>  This is weird. I'm getting replies to my post but still ain't see it 
> here yet!
> Checked the ISP SPAM filter krap and not there either. Most odd.
> 
>  Anyway-
> Can anyone suggest a replacement relay that's readily available? I 
> dare say the frame and contact sets are not unusual but getting the 
> hi-resistance coil will be the hard part. Not seen anything quite like 
> it in any web searching so far.
> I'll have the original in my hand this weekend, so may be able to 
> cobble something together from parts on hand-won't know till I have 
> the real thing.
> 73
>  Dave, ZL3FJ
> (junkboxes only get to be really useful when the cars wont fit!)
> 
> 
I don't like the original relay at all, and I don't like the plug in replacement
much. Neither design has a lot of contact gap when open or much contact wipe when
closing. The original of the VOX relay came packed in tissue paper in
cardboard boxes. At one point the warehouse decided the boxes took up
too much room and so unboxed and unwrapped the relays and tossed them
into a bin. Those relay contact sets are hand adjusted, so are delicate.
After lots of production trouble the warehouse was convinced to scrap
all the relays they bent and to keep them in the boxes they came in
after that.

I prefer the P&B KHP family of armature type relays that may a bit
noisier. They come in two and four pole double throw. You want the 110
volt DC coil to get the right resistance. Lots of catalogs leave out the
110 volt DC coil options. Look at NTE for suitable replacements. And
today the KHP is known as KHUP.
> 
In other brands, though I'm biased towards P&B, like Magnecraft, the VOX
relay might be a 782XDX24L-110D and the antenna relay 782XBXM4L-110D
which are available from Mouser with Mouser numbers 528-782X24-110D and
528-782X4-110D.

In P&B, Drat, not in this Mouser catalog. At least the Magnecraft prices
are nice.


-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer