Re: [Elecraft] [KPA1500] Input Power

I'm suggesting that using a pad to control gain is bad design. A pad is going to necessary to provide the correct 50 ohm termination for the driver. I would suggest that the main gain control component on the KPA500 was T2, although a more detailed analysis may show that some or all of the

Re: [Elecraft] [KPA1500] Input Power

Subject: Re: [Elecraft] [KPA1500] Input Power Using a pad would be bad design, as simply increasing the level of negative feedback would help reduce distortion. The only way one could achieve a repeatable gain close to 15dB would be with negative feedback. Moreover, I assume it is an FCC

Re: [Elecraft] [KPA1500] Input Power

Hopefully your assumptions are off track- Sure would be nice addition to the kx3 73 all Dean K2WW On May 12, 2017 9:17 AM, "David Woolley" wrote: > Using a pad would be bad design, as simply increasing the level of > negative feedback would help reduce distortion.

Re: [Elecraft] [KPA1500] Input Power

Using a pad would be bad design, as simply increasing the level of negative feedback would help reduce distortion. The only way one could achieve a repeatable gain close to 15dB would be with negative feedback. Moreover, I assume it is an FCC condition that modification by the end not be

Re: [Elecraft] [KPA1500] Input Power

, May 11, 2017 9:43 PM To: Ingo Meyer, DK3RED Cc: Elecraft Subject: Re: [Elecraft] [KPA1500] Input Power All of those popular devices have gain more than 15 dB... so there is a pad in the amp to keep the gain at 15 dB. One would think that a "tweak" will evolve to modify the pad (an

Re: [Elecraft] [KPA1500] Input Power

All of those popular devices have gain more than 15 dB... so there is a pad in the amp to keep the gain at 15 dB. One would think that a "tweak" will evolve to modify the pad (and possibly the firmware) to eliminate this bothersome limit. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ

Re: [Elecraft] [KPA1500] Input Power

Hello Mike, Hi, Did you get answer for AC input power demand?   VA or power factor? No, only for the input power (see below), which I want to know. 1500 watts output = 61.8 dBm --> 15 dB gain --> 46.8 dBm = 47.5 ... 48 watts input The gain limit of 15 dB is set by the FCC. ...

Re: [Elecraft] [KPA1500] Input Power

Hello Kevin and all Elecrafter, The gain limit of 15 dB is set by the FCC. There is a move afoot to have them drop that particular requirement but the FCC also moves a "glacial" pace. No telling when it might happen. Thanks for the answers online an offline! 73/72 de Ingo, DK3RED - Don't

Re: [Elecraft] [KPA1500] Input Power

The gain limit of 15 dB is set by the FCC. There is a move afoot to have them drop that particular requirement but the FCC also moves a "glacial" pace. No telling when it might happen. On 5/10/2017 12:30 PM, Ingo Meyer, DK3RED wrote: Hello Elecrafter, I have read the FAQ for the KPA1500.

[Elecraft] [KPA1500] Input Power

Hello Elecrafter, I have read the FAQ for the KPA1500. But there are no informations neither to the minimal or maximal input power nor to the gain. Or did I miss something? 73/72 de Ingo, DK3RED - Don't forget: the fun is the power! www.qrp4fun.de - dk3...@qrp4fun.de