[Milsurplus] Relative value of T-271 ART-28

[WA5CAB at cs.com]

And in case anyone wonders why maintaining a more or less fixed pulse rep 
rate was considered desirable, it prevents an adversary from determining how many 
aircraft are in the area interrogating the transponder.

In a message dated 9/19/2004 7:17:24 PM Central Daylight Time, 
whitaker at pa.net writes: 
> TACAN is pulsed with a pair of pulses 12 microseconds apart.
> The DME pulses which are received are delayed a fixed amount,
> then included in the transmitted pulse train.  In order to
> maintain a fixed transmitted pulse rate the receiver generates
> the required number of pseudo DME pulses called "squitter"
> pulses.  TACAN was known a AN/URN-3 or AN/TRN-6.  TACAN
> azmuth is derived from the shape of the rotating pattern, and
> a clock tick when the patern is headed North.  It appears that
> "P" is used when detecting or ranging is the task at hand.

73
Robert Downs - Houston
(who baby-sat one temperamental AN/URN-3 for most of a WestPac cruise)
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