[Boatanchors] National HFS Coils

[David Hollander]

Hi Gene - I saw your question on the smashed coils. I never noticed that 
when I had the HFS receiver but I would guess that the factory did that 
in order to calibrate the receiver and each receiver was just a little 
bit different at those frequencies.

Before you start laughing, let me give you my thoughts. I worked in the 
RF power transistor group in the 1970's at Motorola. I worked on 
characterizing 28 volt transistors for the 225-400 MHz military band. 
We often mashed down coils while tuning up the circuit in order to cover 
the whole band and achieve optimum performance over the band. The big 
problem was it was a bit difficult to describe in the coil dimensions on 
the data sheet

Some of the frequencies that radio covered were pretty "witchy" for the 
1940's when the receiver was manufactured.

Just my thoughts.

73,

Dave N7RK
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Dave  N7RK          Boatanchors Home Page: http://members.cox.net/n7rk
Phoenix, Arizona         *DXCC Honor Roll*    *WAZ#22 - 75 Meter SSB*

ex-XE2/N7RK, N7RK/ZB2, VK2ERK, ZM0AJN, WB6NRK, WN6IWX

Boatanchor and Antique Radio Collector