[Amps] TRANS WORLD TW500A-RM

[David Gow]

I think there  is some sort of connection but the Transworld TW1000A and
TW500A are totally different beasts than the Metron 1000B if that is what
you are referring to.  The TW1000A and TW500A are large, heavy amplifiers
built for commercial and government service paired with a Transworld
transceiver. The TW series equipment was  found in US consulates worldwide.
They would run 24/7 at full output for RTTY or WEFAX.  I loved my TW1000A
and its 28 volt 80 amp.  ferro resonant transformer power supply.  I only
gave mine to my son in law because I downsized and had no room for the
equipment rack although it only took about 1/2 of a 5 foot rack. The back
story is that in 2005  bought two of the RF Decks and one 80 amp power
supply for $200 in from an ad on the local 75 meter swap net because he said
they did not work.  It turned out the power supply was jumpered for 240 volt
operation and someone had installed a 120 volt plug on the power cord.  That
didn't go over well at all with the ferro resonant power supply.  When I
replaced the plug with a 20 amp 240 volt plug I instantly got 1000 watts out
on all bands with less than 100 watts drive. The second RF deck had blown
final transistors and I sent it to Datron for repair.  $900 dollars later I
had it back with all eight 125 watt transistors replaced.  I also picked up
a surplus Telco 28 volt 40 amp power supply for the second deck but I don't
think he has connected it yet but is keeping the second deck and Telco
supply as spares since he has room.  The amplifier covers 1.8-30 Mhz
continuously with low pass filters switched for a number of frequency banks.

Dave W7VM

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of qrv at kd4e.com
Sent: Wednesday, December 21, 2016 2:09 PM
To: amps at contesting.com
Subject: Re: [Amps] TRANS WORLD TW500A-RM

In the cobwebs of my memory I have a vague notion that the Transworld amp is
associated with the Metron amp - is that correct?

I have the Metron PDF.

David KD4E

> I'm sure that somewhere I have the user manual for the TW500 mobile 
> version. If I can find it and get any spare time over the holiday I'll 
> run it through the scanner.
>
> In answer to Emile's original question - I imagine the main part of 
> the 'FSK option' is a LOT of extra cooling.
>
> Steve
>
>> For any that are interested I sent a manual and some information 
>> attachment to Emile that covers my TW1000A that is basically two 
>> TW500A amplifiers  in one cabinet with input and output combiners. 
>> Transworld was sold to Datron World Communications some years ago and 
>> was still supporting and servicing Transworld amplifiers when they 
>> did a repair on mine in 2009.  I do not have a manual for the TW500A 
>> and suggested he try Datron but I hope someone else here can help him 
>> since what I sent him is similar but not exactly what her has.  They 
>> are great amplifiers and were used in US Consulates all over the 
>> world and have full coverage from 1.8 to 30 Mhz all solid state.
>> Dave W7VM
>>
>> -----Original Message-----
>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Emile 
>> Venter
>> Sent: Wednesday, December 21, 2016 1:37 AM
>> To: amps at contesting.com
>> Subject: [Amps] TRANS WORLD TW500A-RM
>>
>> Hi
>>
>> I have recently acquired an old Trans World TW500A-RM solid state 
>> amplifier.
>>
>> This is the rack mount version of this 500W amplifier.
>>
>> It is a very basic amplifier with absolutely no fancy electronics.
>> The rack
>> mount version was made to only switch bands via a remote switch.
>> However,
>> one of the previous owners installed a band selector switch on the 
>> front panel.
>>
>> Very little information on this amplifier is available on the Internet.
>>
>> In the operator's and technical manual I found on the Internet, it is 
>> mentioned that the "FSK Option" should be installed for high duty 
>> cycle operation such as FSK and CW.  I cannot find any information on 
>> this "FSK Option".  How would I know if this option is installed in 
>> the amplifier I have?
>>
>> Also, if anyone out there can point me in the right direction to find 
>> more information on this amplifier, I would really appreciate your 
>> help.


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