[ARDF] [Melb-ARDF] Fwd: The Case of Missing SI box 101

[Matthew Robbins]

I pulled my Icom 706 (MkIIG) out of a storage box and tuned it around
125kHz. I was able to hear some hash when I stuck the end of the SI box
over the short antenna wire.  No oscillator.

I looked at a BSF7 (new style large) unit and the crystal seems to be a
brass thing with no frequency markings. I got out some old BSF6 (old large
style) units and their crystal was 12.000 MHz.

I can hear an oscillator (BSF7) when I tune around 12.000 MHz, but I can't
be sure it is the SI box. I think it gets louder when I get closer, but I'm
not sure. I can definitely hear hash when I put the coil in the SI unit
over the short wire antenna, and I can hear hash when I punch it, but it's
not a clear, obvious indication like you get with working ARDF gear.

I took a whole box of 21 units and moved it around the little antenna but
no obvious "for sure" indication. It's probably a mistake that I have 50
units (off) about 4m away from all this.

It would be nice to verify the crystal frequency on a BSF7 or BSF8 (again,
the thing that looks like the crystal on the board has no markings I can
see).

Matthew

On Tue, Sep 4, 2012 at 7:57 PM, Mark Besley
<mark.besley at sidrasolutions.com>wrote:

> I think ARDF have five units and the normal clear/start/finish.  I could
> have a look for them in the next day or two when I drop the controls and
> other gear back after tonight’s event.****
>
> ** **
>
> Mark****
>
> ** **
>
> *From:* Ian Dodd [mailto:idodd at iinet.net.au]
> *Sent:* Wednesday, 5 September 2012 9:58 AM
> *To:* melb-ardf at lists.id.oz.au
> *Subject:* Re: [Melb-ARDF] Fwd: The Case of Missing SI box 101****
>
> ** **
>
> I would be impressed if someone can find it using ARDF gear.****
>
>  ****
>
> *Can we get one or two units to verify the concept and check the range?* *
> ***
>
> ** **
>
> AR has a couple of units but are they in Bruce's garage?  I only have
> OV#132 which is nearly flat (just enough juice to beep the flat battery
> signal).  I do have plenty of the mobile-phone shaped units at home (DR
> SIME) which I think have basically the same inerds as the OV rectangular
> units.  All the OV units are with Kath Liley being placed out for the
> coming Vic Champs.****
>
>  ****
>
> Regards
> Ian Dodd****
>