[Milsurplus] SCR-269 & SCR-273 differences

[Sean Barton]

Bruce,

Are you sure it wasn't labeled BC-443?  What you describe sounds like the SCR-263 system.  I have some photos of my BC-443 here:

http://www.fidnet.com/~seanbart/SCR-263/BC443.html

I bought this a few years ago from an ebay auction.  It was listed as a BC-433 but when I received it I found out it was a BC-443.

Sean
KB0OVD

> Date: Fri, 12 Apr 2013 23:15:28 -0400
> From: ka2ivy at verizon.net
> To: Milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] SCR-269 & SCR-273 differences
> 
> On 4/12/13 4:33 PM, Bruce Gentry wrote:
> > On 4/11/13 7:02 PM, Dave wrote:
> >> G'day all,
> >>
> >> I have a query about the differences between components of these two 
> >> Radio Compass systems. SCR-269-* was used in aircraft with 12 or 24V 
> >> electrics whereas the SCR-273-* appears to be (more or less) the 
> >> equivalent for use in aircraft with only 12V electrics. The component 
> >> of each system are as set out below - other components not mentioned 
> >> such as cords and tuning cable/fittings are common to each system.
> >>
> >> The receivers do have different frequency ranges.
> >>
> >> My question is, why the different indicator units? I thought it might 
> >> be just different illumination bulb voltages but the SCR-269 can be 
> >> used on both 12 and 24v anyway. Functionally, can I use the 269 
> >> indicators on the 273?
> >>
> >> I would like to build up functioning systems for both SCR-269 and 
> >> SCR-273. I do have all the components for the 269 and I have the 
> >> receiver for the 273
> >>
> >> I would be interested to hear from anyone who has spare components 
> >> for the SCR-273 system particularly the control box BC-414. The two 
> >> control boxes look identical except for the tuning ranges.
> >>
> >>
> >> SCR-269 (12/24 volt)
> >> Frequency ranges Band 1 - 200 to 410kc, Band 2 - 410 to 850kc, Band 3 
> >> - 850 to 1750kc.
> >>
> >> BC-433* receiver
> >> BC-434* control box
> >> LP-21* loop antenna
> >> BK-22* relay
> >> I-82* indicator Navigators
> >> I-81* indicator Pilots
> >> PL-112 connector
> >>
> >>
> >> SCR-273 (12 volt)
> >> Frequency ranges Band 1 - 150 to 325kc, Band 2 - 325 to 695kc, Band 3 
> >> - 695 to 1500kc.
> >>
> >> BC-413* receiver
> >> BC-414* control box
> >> LP-19* loop antenna
> >> BK-21* relay
> >> I-75* indicator Navigators
> >> I-65* indicator Pilots
> >> PL-117 connector
> >>
> >> Cheers
> >> Dave
> >> VK4KDP
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> >>
> > In 1967, I got what was labeled a BC- 433 receiver from Fair Radio. It 
> > used  24 volts DC as it's only power, had a dynamotor for high 
> > voltage, and did not have any sort of automatic function. It was the 
> > same size and had an almost identical case and front panel to the  
> > ARN-7, but used a manually directed loop and had a "Left-Right" 
> > indicator for the pilot, essentially a repackaged  MN-26.  Has anyone 
> > ever seen one of these, even better, does anyone have one they are 
> > willing to part with?    Thanks,
> >
> >  Bruce Gentry,    KA2IVY
> >
> 
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