[Heathkit] HW-101 for PSK31? -- Hot-rodding relays

[Sandy]

I have found in the past, most of the older boat anchor rigs are not really 
suitable for PSK!  They may "sound stable" but they drift ever so slightly 
in one direction then another and cause grief losing phase lock with 
whatever program you use for PSK.  The only rig I was successful with on PSK 
was my old Icom IC-735 that is very stable once it's on for a few minutes.
PSK operation "IS" possible with older tube type rigs, but it becomes a 
chore keeping up with unhearable amounts of drift that drives the PSK 
program "bonkers".

My 2 cents worth.

73,
Sandy W5TVW
----- Original Message ----- 
From: "Miles B. Anderson, K2CBY" <k2cby at optonline.net>
To: <heathkit at mailman.qth.net>
Sent: Monday, September 03, 2007 2:03 PM
Subject: [Heathkit] HW-101 for PSK31? -- Hot-rodding relays


> Am I missing something here?
>
> I see the idea of using over-voltage and a dropping resistor in series 
> with
> it.
>
> Maybe I misread it, but I took the last note to say that the capacitor
> supposed to be shunted across the relay. That doesn't make sense to me. 
> With
> that rig, the in-rush current through the resistor will be large, but most
> of it is going to be expended in charging the capacitor.
>
> I think you want to shunt the capacitor across the dropping resistor. When
> the "switch is closed," the capacitor is going to hog current until it is
> fully charged, and the dropping resistor is effectively bypassed by a low
> "resistance." This is going to pull maximum initial current through the
> relay and close it in a hurry. Once the capacitor charges, it is going to
> "disappear" from the current path, and the current through the relay will 
> be
> limited by the resistor.
>
> Miles Anderson, K2CBY
> 16 Round Pond Ln
> Sag Harbor, NY 11963
> k2cby at optonline.net
>
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