[Amps] Relais for an antenna crossover switch

[David Cutter]

I saw a lot of these relays at Friedrichshafen for Euro15 last weekend.

David
G3UNA


----- Original Message ----- 
From: "Guido Tedeschi" <guidoted at gmail.com>
To: "Tom W8JI" <w8ji at w8ji.com>
Cc: <amps at contesting.com>
Sent: Wednesday, June 27, 2007 10:48 AM
Subject: Re: [Amps] Relais for an antenna crossover switch


> Thanks to all for the answers.
> 
> The things are changed, because now I have twelve SPST W2W vacuum
> relais like this:
> http://tinyurl.com/37uv8r
> 
> So, I changed my schematic to this one, with only six 30A relais
> instead of 12 and which is also safe for the radios.
> The new schematic is this:
> http://www.hamlan.org/maco/macosafe.pdf
> 
> I opened the 30A relay and I took some pictures, take a look:
> http://www.hamlan.org/maco/668290120000_1.jpg
> http://www.hamlan.org/maco/668290120000_2.jpg
> http://www.hamlan.org/maco/668290120000_3.jpg
> 
> It seems that there are some good and bad things:
> 1) short wide leads to contacts
> 2) the spacing between contacts and/or coil seems good
> 3) the contacts area seems not so large, especially the NC contacts
> (but I will use two in parallel)
> 4) when the coil is energized, the moving contact press the NO fixed
> contact using only its elastic force (not pressed by the armature)
> 5) when the coil is not energized, the moving contact press the NC
> fixed contact using the elastic force of the armature (it is pressed
> by the released armature)
> 
> I searched for "relay" on towertalk (very good mailing list, I will
> subscribe also to that one!) and I found many very interesting
> messages (many from Tom) about relais and RF.
> 
> Tom, what kind of error you have opening my links?
> 
> Thank you very much to all.
> Ciao and 73
> Guido, ik2bcp
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps