Welcome to the new FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
Need the latest SmartSDR, Power Genius, Tuner Genius and Antenna Genius Software?
SmartSDR v3.7.4 and the SmartSDR v3.7.4 Release Notes | SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
SmartSDR v1.12.1 and the SmartSDR v1.12.1 Release Notes
Power Genius XL Utility v3.8.8 and the Power Genius XL Release Notes v3.8.8
Tuner Genius XL Utility v1.2.11 and the Tuner Genius XL Release Notes v1.2.11
Antenna Genius Utility v4.1.8
SmartSDR v3.7.4 and the SmartSDR v3.7.4 Release Notes | SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
SmartSDR v1.12.1 and the SmartSDR v1.12.1 Release Notes
Power Genius XL Utility v3.8.8 and the Power Genius XL Release Notes v3.8.8
Tuner Genius XL Utility v1.2.11 and the Tuner Genius XL Release Notes v1.2.11
Antenna Genius Utility v4.1.8
If you are having a problem, please refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.
Flex 6500 with Elecraft KPA500/KTA500 Combo - Amp Output Pulses Above 300 Watts
Skip Donnell
Member
Received my KPA 500 / KAT500 combo for Christmas. Got them hooked up and they were working like a charm and have for several days. I am mostly on digital and will typically run around 300 watts out. I am using a Flexradio 6500 and my output on it is around 22 watts. Today, I pushed the output up to around 27 (which drove the amp over 310 watts). At that time, the power meter started surging (sorry, best way that I can think to describe it). It amp never went above 310, but it was like the power was being cycled on and off to the unit. The output was pulsing high and low. When I backed the Flex back down to 22 watts, and the output of the amp was 300 or less, this issue stopped. I am assuming it is the protection system for the amp. Still, I would like to know what the possible cause of this likely is so that I can troubleshoot and fix it. Any advice that can be provided would be greatly appreciated!!
73
KD9EGK
73
KD9EGK
0
Answers
-
Skip,
Do you have the ALC line connected? It sounds like the Flex ALC is responsible for the power fluctuation. I have been using a KPA-500 for years with my Flex and never used ALC.
73,
Doug K4DSP
0 -
Yeah, sounds like ALC. Mine would peak to 600 watts max but was a little overdriven - would run full out at 500 all day as I recall, no problems.0
-
22watts should give an output of 350 watts with the kpa500 if your modulation is correct so if you have poor modulation and increase your power you are creating instability and hurting the amp by surging due ti in sufficient drive. You wii most likely find with a rtty or fm modulation it will drive the amp normally. You dont need alc connected to the kpa500 at all.0
-
If you are using ALC, I would disconnect it. You do not need ALC with the KPA 500. I have a 6500, KAT500 and KPA500. I use it on digital and phone. I just set the drive for each band/mode to provide the desired power. I don't see any issue at all. It just like having a 500 watt transceiver.
Is it possible you have the KPA500 connected to a soft AC line? You can check the HV on the KPA screen while transmitting with power. Top left button on the KPA front panel.
Larry, W1IZZ
0
Leave a Comment
Categories
- All Categories
- 280 Community Topics
- 2.1K New Ideas
- 521 The Flea Market
- 7.5K Software
- 6K SmartSDR for Windows
- 143 SmartSDR for Maestro and M models
- 349 SmartSDR for Mac
- 247 SmartSDR for iOS
- 228 SmartSDR CAT
- 168 DAX
- 350 SmartSDR API
- 8.7K Radios and Accessories
- 7K FLEX-6000 Signature Series
- 835 Maestro
- 43 FlexControl
- 842 FLEX Series (Legacy) Radios
- 786 Genius Products
- 413 Power Genius XL Amplifier
- 274 Tuner Genius XL
- 99 Antenna Genius
- 237 Shack Infrastructure
- 161 Networking
- 397 Remote Operation (SmartLink)
- 124 Contesting
- 617 Peripherals & Station Integration
- 122 Amateur Radio Interests
- 855 Third-Party Software