TE Systems 1412G 2c meter amp.
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Loren Moline WA7SKT
Apr 27, 2016, 12:05:59 PM4/27/16
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Hello,
I have a ham friend in Texas that bought one of these amps and does not get full output at 2 meters but it puts out full into a dummy load at 150MHz. I am wondering if anyone else has had one with this problem. It looks like maybe a capacitor or coil has changed value in the unit. I am sure he has tried adjusting the trimmers.
I told him to check the SWR of the input to see if maybe some component failed there. Of course he will have to isolate the problem as being either on the input or output to go farther. Thanks!
Loren Moline WA7SKT
Member: Pacific Northwest VHF Society and ARRL
Loren Moline WA7SKT
Member: Pacific Northwest VHF Society and ARRL
Member: Hearsat Satellite Monitoring Group. www.uhf-satcom.com
Member: CVARS-Chehalis Valley Amateur Radio Society
Member: CVARS-Chehalis Valley Amateur Radio Society
Starchat IRC: Channel = #hearsat
RF Electronics: Starchat IRC: Channel = #rfelectronics
Grid: CN86mr
RF Electronics: Starchat IRC: Channel = #rfelectronics
Grid: CN86mr
Edward R Cole
Apr 27, 2016, 12:54:49 PM4/27/16
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Loren,
Specs from the TE website are Pin=25w Pout =160w; Pin=50w Pout=200w at +13.8v 22A.
My first suggestion would be to check SWR of output cable to the antenna, since it shows proper output into a 50-ohm load. But you say it tested at 150-MHz? The amp is designed for 144-148 MHz and output filter probably is not optimum outside the 2m band (was 150-MHz a misspeak or generality?). The amp may work at 150-MHz into a proper load but a 2m antennas will not be a proper load at 150-MHz.
One general comment on TE is they are good amps but one might add a fan to cool the heat sink if its to be run on FM or digital modes. The output transistors are a stressed at full output and TE amp have been known to fail pretty easily.
12v inexpensive 4-inch square fan will do. I use Masscool-FD12025S1L3/4 120mm fans that cost only $6.50 on e-bay and run fairly quiet on the 2m 80w linear amp that I make:
http://www.kl7uw.com/kits.htm
73, Ed - KL7UW
Specs from the TE website are Pin=25w Pout =160w; Pin=50w Pout=200w at +13.8v 22A.
My first suggestion would be to check SWR of output cable to the antenna, since it shows proper output into a 50-ohm load. But you say it tested at 150-MHz? The amp is designed for 144-148 MHz and output filter probably is not optimum outside the 2m band (was 150-MHz a misspeak or generality?). The amp may work at 150-MHz into a proper load but a 2m antennas will not be a proper load at 150-MHz.
One general comment on TE is they are good amps but one might add a fan to cool the heat sink if its to be run on FM or digital modes. The output transistors are a stressed at full output and TE amp have been known to fail pretty easily.
12v inexpensive 4-inch square fan will do. I use Masscool-FD12025S1L3/4 120mm fans that cost only $6.50 on e-bay and run fairly quiet on the 2m 80w linear amp that I make:
http://www.kl7uw.com/kits.htm
73, Ed - KL7UW
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73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
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