[ARC5] Spotting

[Leslie Smith]

  Hello Tom,
  John refers to the BC-221; this is the instrument used to set the
  operating frequency of the command sets.
  The operating frequency would be given in "orders for the day" (or
  similar), and the "gear" set on frequency in the early hours of the
  day - by a tech.
  The BC-221 was battery operated and dragged around on some sort of a
  trolley.

  You'll find a circuit of the BC-221 easily.
  The instrument is a hetrodyne frequency meter - a tech sets the BC-221
  to the desired frequency using the calibration handbook  (in the front
  of the instrument).
  Using head-phones, the tech would listen to the 'beat' between the
  BC-221 meter, and the transmitter.

  I've owned several '221s - they are a lovely instrument from that era.
  - Simple but elegant.
  I still own 2 - gave the rest away to operators who use gear from this
  period.  
  John also mentions the "LM".  This is a variant of the BC-221, in
  other words a frequency meter, but UK (I think).
  I've only seen one or two LMs.  One (a rusted hulk) was bought for
  restoration.

  Collecting (and operating) these sets is a wonderful interest.


  73 de Les Smith
  vk2bcu at operamail.com


On Fri, Nov 8, 2013, at 6:38, J. Forster wrote:
> BC-221-xx or LM-xx
> 
> -John
> 
> ======================
> 
> 
> 
> >
> >
> > I am new to operating the command sets and have some questions for the
> > list. I am building an authentic setup using dynamotors in both receivers
> > and transmitters and have the shelving desgin to hold it all just about
> > complete thanks to Mike (you know who you are) How did they back in the
> > day spot the receive and transmit frequencies to each other? Did they do
> > it live on air or was there a way
> > to do it without transmitting? I am also looking for a BC348 and ART13 to
> > go with my setup and will be in Phoenix, Az. during the week of November
> > 19th through the 22nd in case anyone has Command sets they are looking to
> > unload.
> >
> >
> >
> >
> >
> >
> > Thank You
> > Tom ElmoreKA1NVZ
> > Anchorage, Ak
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