Welcome to the FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
Need the latest SmartSDR or 4O3A Genius Product Software?
SmartSDR v4.1.5 | SmartSDR v4.1.5 Release Notes
SmartSDR v3.10.15 | SmartSDR v3.10.15 Release Notes
The latest 4O3A Genius Product Software and Firmware
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.

DEMI 2m LPDA vs transverter

Mark Erbaugh
Mark Erbaugh Member ✭✭
edited February 2020 in FLEX-6000 Signature Series
I would like to add 2 meters to my 6700. Someone here recommended the DEMI 2m LPDA, which takes the mW output from the 6700 and amplifies it. The alternative is a transverter that takes another band output. If I go with the LPDA, I’m pretty much locked into the Flex, while a transverter would be usable on other radios. I’d appreciate comments or comparisons.

Answers

  • David-N5PSM
    David-N5PSM Member ✭✭
    edited February 2020
    2mLDPA is the way to go.

    The 6700 already has 2m......Why convert twice?
  • David-N5PSM
    David-N5PSM Member ✭✭
    edited August 2019
    I realize I may come across a bit "flip" with my above statement,  I apologize for that,

    I would also like to say that all transverters have a band pass and the gain response of the pass-band  is not flat.   I have a 6300 with a XV144 (Elecraft) and I have a 6700 with a 2mLDPA (HP version) and there is a drastic difference.  I strongly recommend the 2mLDPA for the 6700.  If you can borrow a transverter and connect it,  but also connect a seporate antenna directly to the 6700 via the other receive path (RXA or RXB) ,  you can compare the receive by opening two pan adapters.  The 6700 has 2 SCU's so you can compare them live..........

    73 de N5PSM
  • Mark Erbaugh
    Mark Erbaugh Member ✭✭
    edited August 2019
    Thank you for the reply. It does make sense to use the 2m capabilities built into the 6700. 
  • Mark Erbaugh
    Mark Erbaugh Member ✭✭
    edited February 2020
    My DEMI 2m LPDA is hooked to my Flex 6700. Feeding it with the same antenna, signals are much lower than on my Yaesu FT-1500 FM rig. For example, one repeater about 30 miles away comes in full scale on the Yaesu, but only S4 on the Flex. Is there something I could be missing with my configuration. I purchased the remote option and have the Flex USB port configured. It seems to be working in that the DEMI comes on when I enable the USB port and switches from RX/TX with MOX. The DEMI is configured with the COMMON (one antenna).

    73,
    Mark
  • David-N5PSM
    David-N5PSM Member ✭✭
    edited October 2019
    Suggestion......Take the 2mLDPA out of the circuit and compare again, Remember the 2mLDPA is only an amp and preamp,  compare the spec sheet of the 6700 2m performance to the FT-1500 specs and see what you find?    

    73 de N5PSM
  • Mark Erbaugh
    Mark Erbaugh Member ✭✭
    edited February 2020
    I hooked the antenna directly to the Flex 6700 and the input signal (from a repeater) went from S3 to S4. I discovered that the LNA in the LPDA was disabled. Once I enabled that (under USB port setup), the signals are much improved.
  • John - AI4FR
    John - AI4FR Member ✭✭
    edited October 2019
    Check antenna gain. Slider on the left in SSDR.

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