Sprague Hypass Items in a SB-220

[Sandy W5TVW]

----- Original Message -----
From: "John C Adkins" <adkinsj at COMPUSERVE.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, September 16, 2001 7:09 AM
Subject: Sprague Hypass Items in a SB-220


> Thanks for all the replies.  Joseph Pinner, KC5IJD sent me this specific
> information.
>
> >>>>They are 0.1 600V feedthrough type bypass capacitors.
>
> >>>>Probably used to filter some lines

The Sprague "Hypass" feedthru capacitors were rather unique.  They were
used in the prevention of TVI (RFI) and, if properly installed, were very
effective.  They would keep interference "in" a transmitter and "out" of
a receiver.  Regular bypass caps. did not do what the "hypass" ones did.
The capacitors were rather expensive back then, so a lot of amateurs
didn't use them unless necessary, or perhaps when they had a very
"sticky" TVI problem they were trying to  solve.

73,
Sandy W5TVW

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