[BC] Re: [BC Differences MW Xmtrs

[Robert Meuser]

No the 3 CX15000 is not a smaller tube than the 4CX15000. The difference 
is the 3CX is a triode and the 4CX is a tetrode. Harris was always big 
on triode RF stages. I am not sure of the logic behind using a tetrode 
as the mod.

R


boydsirboyd at aol.com wrote:

> dave
> 
> 
> thanks for the info. actually in the MW50 the 4CX1500a driver tube was removed due to a modification from harris. so now it only has 3 tubes, 1 4CX35,000a in the modulator cabinet and 2 in the pa cabinet 1 4CX35,000a output and the 4CX1500a driver.
> i have the book on the MW10 and the pa tube is a 3CX15000h3, and the modulator is a 4CX15000a. yep the tube numbers are correct. tho the tube sizes is odd, the pa tube is smaller than the modulator tube.
>  
> bill wdab wcsz wtoy 
>  
> -----Original Message-----
> From: dhultsman5 at aol.com
> To: broadcast at radiolists.net
> Sent: Thu, 22 Feb 2007 8:01 PM
> Subject: [BC] Re: [BC Differences MW Xmtrs
> 
>  Bill:
> 
>I am not an expert on "MW" transmitters
> 
>The MW-50,  50 kW. rig  uses four tubes as I recall  2 each 4CX35,000A, and 2 
>each 4CX1500A tubes.  The transmitter uses a "Pulse Duration Modulator" tm . The 
>first units had a fifth tube for a damper diode.
> 
>The MW-5 and MW-10 are similiar transmitters in size and technology, employing, 
>two tubes in each,  the MW-5 has a 3CX2500 and a 4CX3000 PWM  modulator.   I 
>don't recal the MW-10's tube types I am certain someone will chime in here on 
>the old party-line.
> 
>The MW-1  was a 1 kW. Solid State AM transmitter using "PSM" tm,  Progressive 
>Series Modulation and had no vauum tubes.
> 
> 
>Dave Hultsman
>
> 
> 
>-----Original Message-----
>From: boydsirboyd at aol.com
>To: broadcast at radiolists.net
>Sent: Thu, 22 Feb 2007 6:47 PM
>Subject: Re: [BC] power output formula
>
>
> thanks for the answer and the formula, i was the one having a time with a MW50 
>harris transmitter here in south carolina. but it's up and running just fine. 
>now to fix the kintronics switching unit.
> one other thing, since i got this one up and running so good, what are the main 
>
>differences between the MW50,,,MW10,, MW5,, and the MW1 harris rigs? except the 
>output power. i know the cabinets of the MW10 and the MW5 are half the size of 
>this baby, but the MW1 is one cabinet correct?
> 
> bill
>    
> 
>
> 
>
>  
>