[Johnson] Johnson 500 Power Supply RY302 Relay Needed

[Ed Wirtz]

I see where Craig is going. I did put some delay into the circuit I used. 
I'm going to go look into my notes to try to remember how I did it. The 
original relay had a built in delay which worked quite well.

Ed, KØBKA
----- Original Message ----- 
From: "Craig C. Heaton" <wd8kdg at worldnet.att.net>
To: "Ed Wirtz" <ewirtz at hbci.com>; "Roger Shultz" <nj2r at earthlink.net>; 
<johnson at mailman.qth.net>
Sent: Wednesday, April 11, 2007 11:20 AM
Subject: RE: [Johnson] Johnson 500 Power Supply RY302 Relay Needed


> To All,
>
> Haven't been down this road yet, but I can see where Roger is going. I'd
> like to have a spare RY302 for my 500! According to the manual it is a 
> fast
> make-slow break relay. Looking at the schematic, I don't see a RC circuit 
> on
> the this dc relay to delay it's opening. So, it might be a mechanical
> thing??? The delay is needed to allow time for RF power to decay, the HV
> relay opens first-RF decays; then RY302 opens, the exciter goes quite and
> the receiver can come on line without damage to the front end.
>
> On my 500 I think RY302 doesn't delay anymore. Can only hear one click 
> from
> RY302 & RY303. So I added a DPDT delay relay to keep the receiver off line
> (muted) for a fraction of a second.
>
> 73's
> wd8kdg
> Craig
>
>
> Hi, Roger,
>
> I don't have an original relay, but you can get a  4 pole, 115V DC relay
> from Potter Brumfield. Mouser has them and I suspect Newark or Allied as
> well. That's what I did and it works great. Actually the new relay is a
> better one than the original, it fits in the same space and is a lot
> quieter. Unfortunately I don't remember the part number of the relay but
> it's a pretty common variety.
>
> Good luck!!
>
> Ed, KØBKA
>
>
>>I imagine it is unlikely to find one but does anyone have one of the 4 
>>pole
>>115 vdc relays identified as RY 302 as is used in the Johnson 500 power
>>supply?
>>
>> I can use a 3 pole and am presently doing so losing only the receive mute
>> contacts which can be picked up from a set of external contacts on the
>> coax relay, but...I'd like to make it "original" if at all possible.
>>
>> TNX, Roger, NJ2R
>
>
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