[Top] [All Lists]

Re: [Amps] 3CX1500C7 Cavity

To: "Glenn McNeil" <>,<>
Subject: Re: [Amps] 3CX1500C7 Cavity
From: Alek Petkovic <>
Date: Thu, 06 May 2010 20:13:55 +0800
List-post: <">>
G'day Glenn

It is more than likely one of the units from the Siledis (spelling?) 
project of when they held the America's Cup off Fremantle here in 
Western Australia. They were pulse transmitters on 70cm. Locals were 
not allowed to use the band at the time that they were racing. There 
were 2 types. One had the 8938. I think that was the 60kW unit. The 
other was a 20kW unit and it ran the 3CX400U7 or in some cases the 3CX600U7.

As you say, they were conduction cooled with a big beryllium disc to 
conduct the heat to the heatsink.

A mate of mine fired up one of the smaller units on 70cm. I think he 
still has it. Instead of its intended pulse service, he used it in 
SSB mode and it worked a treat but it had to have such a huge amount 
of air over the heatsink that he ended up shelving it. It just got too hot.

If we are talking about the same units, they would be difficult, if 
not impossible to convert to forced air cooling.

Local hams got all the units but nobody really used them. I believe 
they all would have ended up at the scrap metal dealers. We had a few 
8938s which we swapped for other tubes and I think I still have one 
of the 3CX400U7 or 3CX600U7 tubes floating around somewhere and I 
believe I tripped over one of the small cavities at my club a few weeks ago. .

Good luck with it.

73, Alek

At 05:55 PM 6/05/2010, Glenn McNeil wrote:
>Hi Guys,
>I have come across a 3CX1500C7 UHF Cavity, conduction cooled, which 
>I am assuming is an Eimac product. The thing does not have any 
>indentifying marks on it, but is in very good condition. The Guy I 
>got it from tells me that he had it functioning on 70cms...does 
>anyone have any knowledge of these things ?
>Amps mailing list
>Email scanned by PC Tools - No viruses or spyware found.
>(Email Guard:, Virus/Spyware Database: 6.14940)

 From sunny Binningup, Western Australia 

Email scanned by PC Tools - No viruses or spyware found.
(Email Guard:, Virus/Spyware Database: 6.14940)
Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>