Hi all am looking at buying a Anytone at-6666 have read good things mostly but have read they can blow the finals as from too many amps !!!. So can the amps be turned down from the front panel controls. OR turn down to run a linear amp to take the load of the radio finals. IF i run linear how low of power would i have to go for safe input to linear. linear is a KLB-240 Low power is 150 watts , high 250 or maybe 300 . Also would it be a good idear to run cooling fan to feed a flow of air to inside of radio to keep finals cool. thanks. john
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anytone AT-6666 AMPS TURNED DOWN
- Thread starter johnxb351
- Start date
Too many amps.............hmmm. I think you mean too many watts. Some newer mosfet powered radio's don't like high SWR or being overtuned. If you buy the radio from a trusted shop that does good tech work you should be fine. Or if you buy an untouched radio that is in factory spec tune it should last and be fine as well.
I assume that's a 50 watt radio with variable power. Your going to have to run it as low as it goes until you see what the numbers are. The KLB 240 I just looked at had a pair of 2290 finals so it will be a low drive amplifier.
I assume that's a 50 watt radio with variable power. Your going to have to run it as low as it goes until you see what the numbers are. The KLB 240 I just looked at had a pair of 2290 finals so it will be a low drive amplifier.
johnxb351,
If your amp does indeed have 2 Toshiba 2SC2290's in it, per the datasheet (link below), 8 watts PEP input is the maximum rating.
Can't answer the question on the Anytone AT-6666 concerning the variable output power. I do own one but it hasn't been out of its box yet. (Wonder if that voids the warranty?
)
http://cbtricks.com/radios/galaxy/datasheets/transistors/pdf/2sc2290.pdf
Good Luck.
73
David
Edited to show 8 watts PEP-2 transistors instead of the original quote of 4 watts PEP-1 Transistor.
If your amp does indeed have 2 Toshiba 2SC2290's in it, per the datasheet (link below), 8 watts PEP input is the maximum rating.
Can't answer the question on the Anytone AT-6666 concerning the variable output power. I do own one but it hasn't been out of its box yet. (Wonder if that voids the warranty?
)http://cbtricks.com/radios/galaxy/datasheets/transistors/pdf/2sc2290.pdf
Good Luck.
73
David
Edited to show 8 watts PEP-2 transistors instead of the original quote of 4 watts PEP-1 Transistor.
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John 351 on a 2 pill 1 to 2 watts in, is all I think you can do and be kind to the amp. Think of this to, # 1 you can not have 2 watts in AND have it swing to 30 watts Bye Bye Amp. It will get to Hot to much power in. #2 YES, a Fan is a very Good thing to do on any amp. #3 If you need or want 300 watts you will need a bigger amp. If you see 175 watts out of it you will be doing good. And you do not say if you will be on AM or FM or SSB it will make a difference on how many watts you get.
No more than a 2 watt deadkey into the amp. Set your deadkey/carrier on the radio so when you key the amp you see a 30-40 watt carrier. That will probably be somewhere between 3/4 watt and 2 watts into the amp. BE VERY NICE TO THOSE 2SC2290 PILLS. 175-200 PEP is what you can expect from this amp at 12-14 volts. You will see more watts if you run it at 18 volts but its not worth it. If you want to see 300 watts you need a 4 pill or a hotbox 1x2 which i do not recommend.
On AM when you key the mic but do not speak that is called a dead key or carrier, it will be a constant wattage number. On your radio the variable power on the front of the radio will adjust this to a range of say 2-12 watts.(my best guess)
When you speak the wattage will peak or swing out to a maximum number. So, with your low drive amp you want to keep the AM dead key at 1-2.5 watts and the maximum peak wattage to 20 or less. If you overdrive the amplifier with either too much input dead key or too much peak drive it will run hot and you will blow it.
On SSB mode there is no carrier or dead key like on AM, it's all modulated watts. If you key the mic but don't speak on SSB the watt meter should read zero. So in this mode the variable power on the front of the radio will adjust the peak SSB power level. Something like 10-16 watts PEP on SSB should be fine for your amp. Once again if you swing 30,40,or 50 watts into the amp on SSB it will run hot and blow up. (note PEP stands for peak envelope power)
Good luck
I should add one more option since your radio has it. Be careful if you try FM. FM mode is all carrier watts, there is no swing or peak. The radio and amp will get warm fast on FM so keep the power levels turned down. The RF power control on the front of the radio should adjust this power level as well. You might have a range of say 2-30 watts in FM mode. For barefoot operation run it at 10-15 watts and if you run the amp try 5 or less watts input to the amp. This might give you say 40-60 watts out from the amp on FM. Don't run the amp higher then say 70 watts FM.
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