AN/APN-1 is an operating in the UHF band airborne Frequency-Modulated Continuous-Wave (FMCW -radar) radar altimeter designed for installation in aircraft to provide direct indication of altitude above terrain during flight.

The AN-APN-1/-ARN-1/AYF/AYB series of low altitude radar altimeters were standard fit in many allied aircraft from 1943 onwards. After the war they continued in service with new jet aircraft in...

AN/TPN-1 is a light-weight transportable airdrome homing racon; AN/PPN-1 is a very light-weight paratroop pack-set racon. Five transmitting frequencies and 5 receiving frequencies are available. Sets transmit when interrogated by AN/APN-2.

2017年11月13日 · APN是Access Point Name的缩写，直译为访问点名称。在移动通信网络中，APN用于标识和定位移动设备所需要的数据网络。可以理解为一个唯一的标识符，通过该标识符，移动设备可以连接到相应的数据网络，从而实现数据通信和互联网访问。

AN/APN-1 is an aircraft radio altimeter which will indicate the absolute altitude of an aircraft between the limits of 0 to 4,000 feet, in two ranges: 0 to 400 feet, and 400 to 4,000 feet. B. SECONDARY USES. AN/APN-1, in addition to indicating the altitude of an aircraft, will also operate to furnish visual indication of an aircraft's deviation ...

2020年4月21日 · APN指一种网络接入技术，是通过手机上网时必须配置的一个参数，它决定了手机通过哪种接入方式来访问网络。 对于手机用户来说，可以访问的外部网络类型有很多，例如：Internet、WAP网站等等 (想要了解全部自行度娘)而不同的接入点所能访问的范围以及接入的方式是不同的。 每台手机的出厂的apn方式都已经预先配置好的了。 比如移动的默认是cmnet和cmwap，现在就来分享几个，联不通，移不动，信不过的APN接入点。 一些比较少人使用 …

This FM-modulated radio altimeter was designed by RCA and became operative in 1943, during WWII. It is described in Volume II, ‘Radar Aids to Navigation’, of the MIT Radiation Lab. Series, 1947. Basically the transmitter frequency sweeps continuously between 420 and 400 MHz.

APN（Access Point Name）： 即“接入点名称”，用来标识GPRS的业务种类，是通过手机上网时必须配置的一个参数，其决定了手机通过哪种接入方式来访问网络。 手机均是通过GPRS接入网络，其方式分为两种，分别为 WAP 网络 和 NET 网络。 WAP网络是早期为手机WAP上网而设立的， 通过该接入点可接入一个比较大的移动私网，网内有大量的手机应用下载及资源访问。 因为WAP不接入互联网，使用运营商的私网的服务，所以流量费用比较低廉。 WAP是通过GPRS …

The WWII-era Radio Altitude Indicator, ID-14/ARN-1 was a component of Radio Set AN/APN-1, used to measure and indicate to the pilot the altitude over the terrain during flight. Made by Roller-Smith. See image of technical description of the system.

2004年4月14日 · The APN-1 provided a dual range capability, 0-400 ft and 0-4000 ft. The equipment is a radar altimeter using an FM transmitter and receiver in the 420-460 mc band. The transmitter signal is FM modulated by an approximately triangular wave signal.