[ARC5] 80 KHZ IF

[Kenneth G. Gordon]

On 14 Feb 2021 at 19:59, J Mcvey via ARC5 wrote:

> I thought the later HRO series had 176KHZ IFs,

No. That would have only been the National's Navy RAS series...and it was 175 kc, not 176.

> but I found a reference to 1939 
> Navy RAS National with a 176Khz IF
> It was fashioned after the HRO junior?

Well, kind of concurrently with the Jr. The 175 kc IF was chosen because the RAS had to 
cover the same frequencies as the IF of most radios at the time. It covered MF (190 kc) and 
up through 30 mc. The HRO had to skip the range around 455 kc since its own IF was 455 
kc.

Ken W7EKB