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 v3.8.21 and the SmartSDR v3.8.21 Release Notes
SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
Power Genius XL Utility v3.8.9 and the Power Genius XL Release Notes v3.8.9
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.

ALC power spike info

Steve G1XOW
Steve G1XOW Member ✭✭
edited March 2020 in FLEX-6000 Signature Series
Hi All,

Over the last few weeks I have managed to **** two BLF188XR LDMOS devices for no obvious reason.

The first was using a Flex 3000 and the second using a Flex 6400 a week later. Both radios are only good for 100W max o/p. The amps had 16dB of input attenuation so only about 2.5w hitting the 188XR, 1.8v bais and 51v on PA, hence well within spec.

On both instances the input gate NP junctions had failed (low ohms), most probably due to overdrive, ALC overshoot, TX spike etc. so my question is has anybody used a fast trace scope to observe and record the initial few seconds of TX on a 6400/6600?

Other people must be using LDMOS 188/189 devices with these radios so what experience is there out there about this issue please?

73 Steve G1XOW


Answers

  • Steven WA8Y
    Steven WA8Y Member ✭✭
    edited January 2019
    I have drive (TX setting) limited to 12Watts. Using a 13dB attenuator.
  • Neal Pollack, N6YFM
    Neal Pollack, N6YFM Member ✭✭
    edited January 2019
  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin
    edited April 2019
    Steve

    I am using the same RF-KIT amp you are with 13db pads and have yet to have an issue.  

    Have you discussed this with Reinhardt?  Could it be with the method the LMDOS chips are installed as there was a lot of discussion on the RF Kit forum regarding that?

    Mike

  • Doug Hall
    Doug Hall Member ✭✭
    edited January 2019
  • Dee Hendricks
    Dee Hendricks Member ✭
    edited March 2020
  • Tom W3FRG
    Tom W3FRG Member ✭✭
    edited March 2020

Leave a Comment

Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.

Comment As ...

Categories