[ARC5] ARC5 Octal Crystals

[AKLDGUY .]

> Do you know what frequency those marker crystals ....... ran on?

In case by "ran on" you mean that the crystals operated in an oscillator
circuit,
they did NOT.

When the transmitter tuning knob was rotated to the setting where the VFO
frequency matched the crystal frequency, the high impedance of the crystal
caused a very sharp indication in the magic eye tube.

This indication could be seen either directly by looking down on the tube
with
the cover open, or from the front by setting the cover to an appropriate
angle
and looking in its mirror. Thus it was (and still is) possible to check the
dial
calibration. At all times other than frequency match, the crystal is
virtually inert.

73 de Neil ZL1ANM


On Sun, Aug 17, 2014 at 1:29 AM, <bcarling at cfl.rr.com> wrote:

> Thanks John,
>
> Do you know what frequency those marker crystals and receiver crystals ran
> on?
>
> Also - does anyone know what radios used hc6u crystals on 200 kHz please?
> I have several of them I stocked here back when people were asking for
> them a lot,
> but I never figured out what radios they were using them in.
>
> Also - I am not familiar with the FT-230. I need to learn about that, and
> what frequencies
> were used for the receivers.
>
> Thanks again and 73 - Brian AF4K
>
> On 16 Aug 2014 at 9:21, jmfranke at cox.net wrote:
>
> > The octal crystals in the transmitters were not used to directly control
> the transmitter frequency. They were marker crystals and in conjunction
> with the 1629 magic eye tubes would indicate when the transmitter VFO was
> tuned to a specific frequency.
> > A number of the receiver were crystal controlled but did not use octal
> based crystals. Two crytsals could be pluged in to wherre the FT-230 was
> installed on the front panel.
> >
> > John  WA4WDL
> >
> > ---- bcarling at cfl.rr.com wrote:
> > > Question: Does anyone have any ARC5 Octal Crystals that they would
> like reloaded with
> > > amateur band crystals inside?
> > >
> > > Are the ARC5 HF transmitter series basically "straight through" on
> most models?
> > > Or do they use doubling etc. to arrive at the transmitted frequency?
> > >
> > > If I am not mistaken, some of the radios use VFO control and some use
> crystals.
> > > If I have this all wrong please correct me. I am assuming it is the
> transmitters that use
> > > crystals for fixed frequency operation, and not the receivers, right?
> > >
> > > 73 to all - Brian Carling, AF4K
> > >
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