A few general questions

  • 1
  • Question
  • Updated 3 years ago
  • Answered
  • (Edited)
New customer here with a  few questions.  I went ahead and pre-ordered the Maestro  (hopefully will get it before end of year) and will be ordering a 6500 within the next two weeks.

I plan on using the 6500 with a remote SGC-230 tuner on an inverted L.

1) I assume the 6500 internal ATU can be disabled.  Can the TUNE button then be programmed to emit a CW tone of 10 watts?  How long does it last; as long as you press the button?  I assume I'll then be able to monitor SWR (via Maestro) to know if tuning was acheived.

2) Are schematics available for the 6500, and perhaps a block diagram of what's going on inside the FPGA.  Specifically, since there is plenty of processing gain when decimating from 246 Msps to audio, what's the audio and DAX data resolution?  I assume probably 24-bit (48 bit complex samples); what's the width in the FPGA DDC and subsequent decimation chain?

3) Will I be able to use mic and headphones plugged into the 6500 while using Maestro for control?

4) Can I remotely power up the 6500 (i.e. out of a low-power state) via the SmartSDR or Maestro?  In anticipation of WAN access, anyone operating remotely via a VPN?

5) Any IP3 and P1dB data on the PA.  Is there a way to monitor transmit IMD?

6) The TX1 - TX3 outputs; can they be set active low so I can disable my active RX antenna during TX?

 
Thanks,
Lou
KD4HSO
Photo of KD4HSO

KD4HSO

  • 52 Posts
  • 3 Reply Likes

Posted 3 years ago

  • 1
Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 9148 Posts
  • 3466 Reply Likes
1) I assume the 6500 internal ATU can be disabled.  Can the TUNE button then be programmed to emit a CW tone of 10 watts?  How long does it last; as long as you press the button?  I assume I'll then be able to monitor SWR (via Maestro) to know if tuning was achieved.

Yes.  The ATU and TUNE are two separate features.  You will use the TUNE button for the external SGC.  it lasts until you click it again or of you have a TX timeout set (default is not set)

2) Are schematics available for the 6500, and perhaps a block diagram of what's going on inside the FPGA.  Specifically, since there is plenty of processing gain when decimating from 246 Msps to audio, what's the audio and DAX data resolution?  I assume probably 24-bit (48 bit complex samples); what's the width in the FPGA DDC and subsequent decimation chain?

There are no schematics available or any block diagrams of how we have the FPGA programed.  Yes, we optimize the processing gain for decimation and other functions.  DAX audio is 24 kHz @ 16-bit.  DAXIQ is configurable up to 192 KHz @ 24-bit.

3) Will I be able to use mic and headphones plugged into the 6500 while using Maestro for control?

I am fairly certain this will be a supported configuration.

4) Can I remotely power up the 6500 (i.e. out of a low-power state) via the SmartSDR or Maestro?  In anticipation of WAN access, anyone operating remotely via a VPN?

Yes, there is a connection to ground that can be controlled by a variety of IP switches that will power up the radio hardware remotely.

5) Any IP3 and P1dB data on the PA.  Is there a way to monitor transmit IMD?

The FLEX-6500 and FLEX-6700 have the same PA so the testing data provided by the ARRL sill be applicable http://www.flexradio.com/downloads/qst-flex-6700_flex-6300-april-2015-pdf/

At this time there is no capabilities to monitor transmitter IMD.

6) The TX1 - TX3 outputs; can they be set active low so I can disable my active RX antenna during TX?

Yes.
Photo of KD4HSO

KD4HSO

  • 52 Posts
  • 3 Reply Likes
Thanks for the info.

The 6500 has a 10 MHz reference input; correct?
Photo of Peter K1PGV

Peter K1PGV, Elmer

  • 541 Posts
  • 315 Reply Likes
Yes, the 6500 allows for a standard 10MHz reference input. I use one on my radio

Peter
K1PGV
Photo of Dan -- KC4GO

Dan -- KC4GO

  • 339 Posts
  • 68 Reply Likes
Lou, 
1: I currently use an SGC-230 with about 65 ft of wire as one of my antennas. You only need to put  the ATU in bypass to use it with out the ATU. Then all you need to do is press the TUNE button to get it to tune. I also have a Comet 250 broad band vertical and use the ATU on it with Memory so when I select that antenna and a frequency I use quite often it Auto Tunes.  I have limited area for antennas so this is my choice. I also use an MFJ Magnetic Loop that I run into RX-A (use for RX only)
    I've owned 4 SGC tuners and think they are GREAT the one I'm using now spent about 12 years on a Sailboat in saltwater and still works like the day I installed it. The SGC-237 on my RV has been 100,000 miles in 10 years to all states from -15 to +111 degrees with out failure. 

I answered # 1 with first hand knowlage
Tim's answers I would accept as good I just added to #1.
Enjoy you 6500 I know I have. If I win the lottery I'll add a 6700. (as long as it's not the Illinois lottery)  

As I don't contest or chase DX I'll wait on the Maestro for a while. 
Photo of KD4HSO

KD4HSO

  • 52 Posts
  • 3 Reply Likes
Glad to see the the SGC-230 is working with it.  I presently have an IC-725 (my only HF rig since 1992) and AH-4 tuner on a 100' inverted L for TX, and RX is a Pixelsat loop.  The 6500 will be a big step up.  I have some home-brew stuff with GNU Radio and Ettus hardware, but the 6500 will be a lot more integrated.  I don't chase DX or contest either. I envision a beer in one hand and the Maestro in the other, in recliner, bed etc.  Lazy ham I am. 
(Edited)