Re: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.

["Alan Melia" <alan.melia@btinternet.com>]

Hi Joe, why not stick two sets of normal contacts in series....doubles the
gap :-))

Alan

----- Original Message ----- 
From: <jcraig@mun.ca>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, October 10, 2011 11:54 PM
Subject: Re: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.


> Hello Hartmut, Group.
>
> Good to hear from you again, Hartmut.  Thank-you for  the report.
>
> The beacon is on again, but there was some trouble: to use the tower
> on 160m the 500 kHz tuning coil (0.2 mH) is shorted by a relay. The
> N.O. contacts on this relay arced over.  Perhaps a high voltage (vacuum)
> relay would help?
>
> This  problem will be much worse on 137.777 kHz with the higher voltage.
> I have some spiral wound 4mm (Decca) litz to make up the 3 mH for that
> project.  (The spiral winding was inspired by G3NYK's experiments with
> tuning coils on his web page.)
>
> 73
> Joe
>
> On Mon, 10 Oct 2011, Hartmut Wolff wrote:
>
> > Am 2011-10-09 23:50, wrote jcraig@mun.ca:
> >> Dear Group,
> >> Reports on the 8 WPM CW beacon will be appreciated!
> >> 73
> >> Joe VO1NA
> >
> > Attached a screenshot of the 8wpm signal. The signal came up at about
23:20
> > and faded out at about 7:35. The strongest part was between 04:00-06:00
UTC
> > -- 
> > 73
> > Hartmut
> > www.h-wolff.de
> > Locator: JO52hp
> >
>
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