[Boatanchors] HQ-150 Line Bypass Caps Needed

[Carl]

Perceptions, attitudes and regulations changed over the decades. Bypasses of 
.1 and .05 were common in the early years as they actually worked even tho a 
bit of 60 Hz passed thru them to the chassis and could give you a tickle. 
This was accepted back then.

Later the .02/.022 (basically the same cap but standards groups changed the 
game to justify their existence) was used which didnt bypass as well but 
tickled less.

Then the nanny state came into power and decided our sensitive citizens 
shouldnt be exposed to such torture and the .01 or .0047 became standard and 
is generally useless except for very short spikes.

Carl
KM1H



----- Original Message ----- 
From: "Drew P." <drewrailleur807 at yahoo.com>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, August 24, 2010 10:45 PM
Subject: Re: [Boatanchors] HQ-150 Line Bypass Caps Needed


> Hello Bill,
>
> Voltage ratings have been established so that the line bypass caps will 
> withstand most of the sometimes horrendous transients encountered on the 
> line.  They are designed to "fail safe" on very large transients - Y caps 
> will fail open so as not to make the chassis "hot". X caps will not catch 
> fire so as not to make the chassis "hot" in another way.
>
> You might peruse the information available here:
>
> http://my.execpc.com/~endlr/line-filter.html
>
> Drew
>
>
> Bill Stewart wrote:
>
>> At the risk of running this subj. in the ground, let me ask
>> one more question.
>> What governs the capacitance/voltage spec?of the line
>> bypass capacitor? I have several Hammarlund? rcvrs?and the
>> values vary from .01uf used on the HQ-100, 110, 150,?170;
>> .05uf used on the HQ-120X & 129X and .022 on the
>> HQ-140X. And the voltage ratings run from 500V (HQ-120X
>> & HQ-129X)?to 1.4kv on the others.?Some of these rcvrs
>> are similar, but they use diff. values. I assume
>> the?capacitor voltage ratings used?were for DC, but
>> substantial enough to handle 3 or 4 hundred vac (have never
>> noticed any ac ratings for these capacitors).
>>
>> Tnx, Bill, K4JYS
>
>
>
>
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html