Trouble understanding the HOLD functions on NAV radio

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Snoober
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Trouble understanding the HOLD functions on NAV radio

Post by Snoober »

I read the manuals that describe "HLD" and "HLD FRQ" on the NAV1/DME radio but I don't really understand it. I messed around with it and couldn't figure it out.

I assume there is a way to have the DME from one frequency and the 1st VOR needle (the main needle) for a separate frequency? That is what I was trying to do.
FSX Aircraft:
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  • Piper Comanche 250
  • Beechcraft Bonanza V-tail
  • Curtiss P-40 Warhawk
  • North American P-51 Mustang
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Nick - A2A
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Joined: 06 Jun 2014, 13:06
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Re: Trouble understanding the HOLD functions on NAV radio

Post by Nick - A2A »

Hi Snoober,

Rob 'Great Ozzie' Osborne explains it here. The DME is normally tuned by selecting a VHF frequency on the NAV1 radio. This instructs the DME transceiver (which is actually a separate bit of kit) to transmit to the ground station using a 'paired' UHF frequency. However, the DME hold function temporarily prevents the DME transceiver from having its frequency altered by the NAV1 radio, until the DME function knob is placed back in the 'FRQ' or 'TTS' position.

What this means in practice is that if you tune the NAV1 radio to show a DME readout for navaid A, then switch to the 'HLD' position and tune it to navaid B instead, the distance to navaid A will still be shown. (If you switch to 'HLD FRQ' instead, the frequency of navaid A will be displayed instead of its distance from you.)

Cheers,
Nick
A2A Simulations Inc.

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Snoober
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Re: Trouble understanding the HOLD functions on NAV radio

Post by Snoober »

Thanks, I got it working the way you described.
FSX Aircraft:
  • Cessna 182 Skylane
  • Piper Comanche 250
  • Beechcraft Bonanza V-tail
  • Curtiss P-40 Warhawk
  • North American P-51 Mustang
  • North American P-51 Civilian Mustang
  • Piper J-3 Cub

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