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Reviews Categories | Amplifiers: RF Power - 6M/VHF/UHF+ | TE Systems TE 4452G Help


Reviews Summary for TE Systems TE 4452G
Reviews: 2 Average rating: 4.0/5 MSRP: $795
Description: UHF linear amp giving minimum 160W out with about 30 to 40W in. Driver is an MRF650 and the 2 parallel final stages are fitted with 4 x MRF648 transistors. Power can climb up to 200Wout with 13.8V
Product is in production.
More info: http://
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K0HPS Rating: 4/5 Aug 30, 2007 14:31 Send this review to a friend
Some initial problems but fine now  Time owned: more than 12 months
When I first installed the amp back in 1994 it quickly developed problems with T/R switching. Returned it under warranty and after a fairly long turn around time it came back with a new T/R switching board and an output circuit update. It's been fine since then. I'm powering it with an Astron RS-70M through <5 ft. of #4 primary cable and I can get about 180-W out with 25-W in, although I rarely drive it that hard.
 
F5DQK Rating: 4/5 May 12, 2007 07:50 Send this review to a friend
Transforming a 4452RA into a 4452G version  Time owned: 0 to 3 months
I'd recently buy a QRT "technician special" TE 4452RA amplifier only intended for class C operation. After substituting the 4 x MRF648 final transistors it'd work again giving 160Wout with 35Win at 12.5V. In order to transform it into the linear G version, I'd extract it from its previous rack, then add the Guardian electric TRx relay + both separate DC bias for MRF648 driver and final stages + internal temperature switch + printboard DC sockets for future front panel and RF commutation + PTT cinch socket + manual PTT switching board. I need now an adequate front panel, and the G transformation'll be finished.

For these output powers, the TE printboard is exactly the same for all 50, 144 and 435 MHz versions.
I also have the project of making the RFoutput to RFinput connectors DC compatible, target beeing directly feeding a masthead preamp with a rig like the FT-847 giving the +12V bias on the antenna coaxial cable when required. The same'll be done on my TE 1452G. What is the utility of an internal preamp especially on 432 MHz SSB or CW contacts???
The mashead preamp is THE only solution.

3 weeks ago I'd ask TE Systems some help via letter but didn't get any help until now. Curious that in year 2007 thay don't have a little web site and that they are soooo difficult to reach!!

A Powerpoint description of all transformations I did and an Excel Pout/Pin curve is available on request.
PS: in order getting exact metal clad mica capacitor values, do anybody have its UHF internal scheme ?? It'll be greatly appreciated.
 


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