[ARC5] ARC5 Octal Crystals

[WA5CAB--- via ARC5]

Brian,

In a message dated 08/16/2014 13:55:04 PM Central Daylight Time, 
bcarling at cfl.rr.com writes: 
> Do you know what frequency those marker crystals and receiver crystals 
> ran on?

The octal crystal holder used was a type DC-8-(*).  Frequencies that I have 
come across over the years are as follows:

2500 KC  *
3500 KC  *
4600 KC  *
5205 KC
5500 KC
6200 KC  *
8000 KC  *

Frequencies marked "*" are listed in NAVAER 08-5Q-4 on the ATA/ARA. as 
being in the appropriate transmitter.  Except for 2500 KC, the same list is in 
T.O. 08-10-50.  AN 08-30ARC5-2 doesn't have a list, saying merely that the 
frequency must be specified when ordering.  

> 
> 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.

No idea.

> 
> Also - I am not familiar with the FT-230. I need to learn about that, and 
> what frequencies 
> were used for the receivers.

The FT-230 is the little panel and box that plugs into the front of the 
SCR-274-N receivers.  It is the one normally shipped in all receivers.  Besides 
the various aluminum components, it consists of one connector that mates 
with the male mini-banana pins in the front panel recess.  Connector wiring 
consists of only one jumper in the +24 VDC input line.  The receiver was 
turned ON and OFF by a switch on the remote control box located elsewhere.  The 
similar FT-260 has a switch across the two pins in place of the jumper.  
Neither accessory have anything to do with crystals.  I have seen somewhere two 
of three photographs showing a receiver with two crystals mounted in what 
was probably a modified FT-230.  But AFAIK, no documentation has ever surfaced 
on it.  Even if you were to come across an actual modified FT-230, plugging 
it into a receiver wouldn't convert the receiver to crystal control.  Some 
significant wiring modifications would have to be made inside the receiver 
in order for it to work.

As already stated, the crystal doesn't control the transmitted frequency.  
All MF and HF transmitters are VFO equipped (or MOPA) and will work fine 
without a crystal plugged in.  

> 
> 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
> 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480