[GreenKeys] "Thats a transmitter" (was Collins 709D-1 FSK keyer)

[tony.podrasky]

Hello Sheldon & al;

Sheldon - I'm not very RF-savvy.

Can you explain, please, how you can get such power out of a solid-state
device - and how high is the high voltage in the final amplifier?

I know your post says that it was using a combiner - but I had a friend
that worked on the RADAR on an aircraft carrier - and I don't remember
how much power the RADAR ran - but it was well over a Mega Watt. He said
that they had to remember to turn off the RADAR when they came into
the San Diego base - because each sweep would blank out all the TVs!

73,
ton


On 11/22/2014 11:09 AM, Sheldon Daitch wrote:
> In the high power MW broadcast market, the two biggies were Continental
> and Harris.
>
>
> Harris Broadcast built a few DX-2000 broadcast band transmitters - one
> went to Qatar and another went to Vietnam.
>
>
> I saw the DX-2000, 2000kW output, on the Harris test floor, doing a heat
> run prior to shipping to Qatar.
>
>
> In fairness, the DX-2000 is made of 10 200kW power blocks - five power
> blocks feeding a five input combiner, a second channel of five power
> blocks feeding another combiner and those two combiners fed into another
> combiner for the full 2000kW.
>
>
> All solid state.
>
>
> 73,
>
> Sheldon
>
>
>
> ------------------------------------------------------------------------
> *From:* GreenKeys <greenkeys-bounces at mailman.qth.net> on behalf of
> Duncan Brown <duncanancy at earthlink.net>
> *Sent:* Friday, November 21, 2014 2:15 AM
> *To:* Nick England
> *Cc:* Greenkeys
> *Subject:* Re: [GreenKeys] "Thats a transmitter" (was Collins 709D-1 FSK
> keyer)
> But does it do AM??
>
> Duncan
> K2OEQ
>
> On 20-Nov-14 18:07, Nick England wrote:
>> Heh - that's not a transmitter, THIS is a transmitter...
>> http://www.navy-radio.com/commsta/cutler/naa-qst-3.JPG
>>
>> AN/FRT-31 - 2 megawatts output CW or RTTY feeding 62 miles of antenna
>> wire......
>>
>> Nick K4NYW
>> www.navy-radio.com <http://www.navy-radio.com>
>>
>> On Thu, Nov 20, 2014 at 5:42 PM, Duncan Brown
>> <duncanancy at earthlink.net <mailto:duncanancy at earthlink.net>> wrote:
>>
>>     That's not a transmitter,
>>
>>     _*This is a transmitter:*_ http://www.collinsradio.org/821A/
>>
>>     Collins 821A: 250KW (1000KW PEP) output
>>
>>
>>
>
>
>
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