Re: [Flightgear-devel] ATIS frequency selection problem

[D Luff]

Alex Perry writes:

 
 Some units report all three digits, but designers usually want to save
 panel space and omit the unnecessary digit.  Thus, for example,
 the ground control frequency for KMYF is 118.225 MHz but the radio
 actually displays 118.22 (a notam recently changed it from 121.9).
 The radio in 91R, the only one I've needed to use 25kHz spacing on,
 consistently rounds down, so that another frequency might be 119.77.
 

I'm afraid I'm a touch confused here.  How do you actually select 
the 25kHz spacing if it is not displayed?  Is there a different mode 
of radio operation that you can get into where adjustment is in 
25kHz spacing and so the last digit can be inferred, and if so how 
is this physically done?

Additionally, some UK NDBs have the need for an additional digit 
on the ADF display, eg 353.5 at East Midlands.  How does this 
work out in terms of tuning and displaying the frequency?

Cheers - Dave

--
David Luff
Engines Research Group
University of Nottingham
0115-9513814
[EMAIL PROTECTED]

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Re: [Flightgear-devel] ATIS frequency selection problem

[D Luff]

Alex Perry writes:

 
 When you turn the big knob, the whole MHz number changes in steps of one.
 When you turn the little knob, the fractional MHz number changes,
 with the display sequence  00  02  05  07  10  12  15  17  20  ...
 corresponding to the freqs 000 025 050 075 100 125 150 175 200 kHz
 

Thanks for the explanation.  Its all clear now.

I take it we should change the panel from 0.5 MHz on the MMB 
and 0.05 Mhz on the LMB to 1 MHz on the MMB and 0.025 on the 
LMB - would anyone disagree with this?

Cheers - Dave

--
David Luff
Engines Research Group
University of Nottingham
0115-9513814
[EMAIL PROTECTED]

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