[Collins] Collins RF Mixer

[Dr. Gerald N. Johnson]

Not all list users have megabit connections and a single big picture can 
take an hour to download from the mail server at 32K which is all I was 
able to get dial up 7 miles from the central office for years. Then when 
I went to Verizon wireless I rarely got over 250K b/s day times and that 
had a 5 GB a month limit which I approached often. Many modern data 
contracts are 2 or 3 GB a month. With the 5 GB contract I had to set my 
browser to not automatically down load videos or pictures from news 
websites or I would have run over in about 20 days. Initially going over 
cost 25 cents a MB, later it was only 5 cents a MB, but a picture that's 
a MB in your smart phone takes nearly 3 MB to come as an email attachment.

A far more equitable and bandwidth saver is to load such pictures on a 
web page server and post the line to the mailing list. For one thing 
doing an ftp from such a server takes less than half the bandwidth of 
getting as an e-mail attachment. Pictures, ala binary files, are NOT 
attached as raw bytes, but in a code that translates each byte of 
picture data into more than two ASCII bytes so that only digits and 
letters are sent which is all that internet rules for e-mail guarantee 
will be passed. That really slows down the forwarding of pictures as 
e-mail attachments. 64 available symbols to transmit data with 256 
unique symbols.

And then some smart phones make a 2000 x 2400 pixel picture turned on 
its side with information about the real orientation embedded that PC 
users don't make use of so we have to turn our monitors over to see the 
pictures anyway from iPads. Apple has worked to make them incompatible 
despite their products being used by a minority of internet users.

Then think if there are 1000 users on a list the list server has to make 
1000 transmissions of the picture that has grown to more than double its 
original size. The list servers even with fiberoptic connections 
generally can't handle that for one list much less their assorted lists. 
And that puts a lot of time delay on the forwarding with big attachments.

I have also noticed that the TV news pages and newspapers have increased 
their video and picture resolutions to not look bad on the latest iPads 
and that just about locks up my laptop without special care from 
demanding more RAM than will fit.

Put the pictures on a server, your own web page server or several that 
specialize in photo albums and speed up the whole internet by saving on 
bandwidth.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 1/11/2014 4:38 PM, Brian wrote:
> Ditto
>
> Sent from my iPad
>
>> On Jan 11, 2014, at 12:52 PM, "Carl"<km1h at jeremy.mv.com>  wrote:
>>
>> Attachments dont go thru on qth.net.
>>
>> Maybe it is time for this forum to move into the 21st century and find a new home so photos and other info can be shown, stored, etc.
>>
>> Carl
>> KM1H
>>
>>