Hello,

From an old transistor book (1959):



Bertus

PS the attached DJVU file can be read with a DJVU reader:
http://www.djvu.org/resources/

 

Pretty cool picture and later in Vietnam the most popular radio was likely the PRC 25 fondly referred to as a prick 25 by the troops. Also pretty cool is the troop in the picture is carrying his M1 Carbine rifle.

Ron

 

Hello,

Here is some other links with a lot of vintage documents:
https://www.vintage-radio.info/
http://www.g4dmp.co.uk/
http://www.tubebooks.org/

Bertus

 

With transistor, you can now die better faster, more beautiful.

 

And this is 1959... Military development often later becomes the property of the civilian population. Remember for what purposes the GPS was invented.

 

The GPS is still run by the military who can flip the metaphorical switch and turn Selective Availability back on ... Degrading civil performance.

 

The GPS is still run by the military who can flip the metaphorical switch and turn Selective Availability back on ... Degrading civil performance.

That used to be the case. Since many commercial aircraft use GPS it would be a significant safety issue if the military turned it off -- especially if there was short notice.

New GPS satellites are being put into service. I wonder if they have new modes that don't overlap with the civilian uses. This would allow the military exclusive use of the GPS for military-only purposes without degrading civilian use.

This assumes that leaving the civilian service at full capability does not add to military threat from others using it. I doubt this is the case since there are now alternative GPS-like navigation systems that the US can't turn off short of permanently disabling them.

 

The old VOR still exists. The only difference is the commercial aircraft would really on that technology and not GPS. Degrading the signal would not interfere with long flights as the accuracy degrades to a couple hundred of meters. Flying translantic that wouldn't mean a thing except their fuel consumption would increase.

They still fly the old routes in country.

Now, private pilots fly GPS. Crop dusters rely on GPS to fly a specific pattern so the proper chemical mix can be dispersed.

Time dissemation would be affected. Those that rely on GPS in that arena can use the secondary PNT provider, but wait, they turned that off in 2010. I guess they will have to buy their own cesium oscillators and maintain their own time base until a secondary PNT provider is identified.

If the FCC allowed it, in the U.S. you could use GLONSS or the European or China's GPS.