[Milsurplus] Collins automatic antenna coupler / tuner

[Francesco Ledda]

You are right. My 490T-9 has an ARC-174 tag.

But, this is confusing:

I have an ARC-174 system, and this has a 100W RF amp with built in coupler. What amplifier was used with the 490T-9?

Sent from my iPhone


On Apr 11, 2011, at 9:46, Mike Morrow <kk5f at earthlink.net> wrote:

>> It is pretty much the same unit. It seems to be part of a set up to replace
>> the original pieces of the ARC-38A with the 618T.
> 
> The AN/ARC-94 seems to have been the USN's replacement for their AN/ARC-38A.
> The AN/ARC-94 is in fact a USN version of the 618T-2, but early installations
> used the CU-991/AR which is identical to the old 180L-2, and only covered up
> to 25 MHz.  The CU-1669/AR was the first 490T type of coupler (490T-1A) that
> allowed operation to the 30 MHz limit of the AN/ARC-94.
> 
> The web site http://tsc-60.cellmail.com/tsc-60/other/174/index.html has some
> sparse info on several variants of the 490T, excerpted below: 
> 
> --------------start excerpt------------
> Antenna Couplers
> 490T-1
> 490T-1A  Used with the 618 series. AKA CU-1669A system. Supports 630 Watts
>          and requires 115 VAC, 400 hz
> 490T-2   Used with high power systems
> 490T-2A
> 490T-3   Used with high power systems such as the 718U-2 series
>       Rated at 1.2 KW average or peak. Required single phase 400 Hz 115 VAC
> 490T-4       Rated 1.2 KW Average or peak. Used as a line flattner
> 490T-9   Used mostly with the 618T-2 series, Part number 522-4994-001,
>          115 VAC/400 HZ power requirement
> --------------end excerpt--------------
> 
> That mentions "high power systems" for some models (used with 718U, AN/ARC-174),
> so maybe Jim's 490T-9 is rated for the 1.2 KW PEP mentioned for some other 490T
> versions (even though there are no 618T models rated above 400 watts PEP, AFAIK).
> 
> Mike / KK5F
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