SSDR 1.3.8 transmit interlock does not function in CW mode

  • 2
  • Problem
  • Updated 4 years ago
  • Acknowledged
  • (Edited)

Caution to owners of SteppIr antennas

On F6700 running SSDR vers. 1.3.8 the transmit blocking does not seem to work in CW mode.  I have attached two pictures below:

Transmitting CW with SteppIr at frequency


Transmitting CW with SteppIr while it's changing frequency [don't worry I am actually

transmitting into a dummy load attached to another antenna output on the linear]

Note that SSDR thinks it is inhibiting/blocking the transmission but the RF is

still being emitted.  The interlock DOES work correctly on DIGU, DIGL, USB,

LSB modes.

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George O'Brien, AB4FH

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Posted 4 years ago

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Tim - W4TME, Customer Experience Manager

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I have entered this problem report into our bug tracker for additional investigation. Thank you for the defect report.
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George O'Brien, AB4FH

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Edited: 9:38 EST  19 Nov 2014

I have tried to gather further information for the developers.  It doesn't matter if the rig is using one antenna (both TX/RX on ANT1 for example) or on separate antennas (RX on RXA and TX on ANT1), the problem of non-inhibition of transmission remains.  I had hoped to see different results with the QSK indicator off, but no joy.  Meanwhile, when I am in CW mode (about 95% of my hamming) I have to remember to wait until the SDA100 controller's tuning LED goes off or I will damage the DB18, especially with 1.5 KW output.  Hopefully, this has already been resolved in vers. 1.4

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KY6LA - Howard, Elmer

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You can use DDUTIL to inhibit transmit when the SDA100 is changing frequencies.
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George O'Brien, AB4FH

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I am currently using the Data In port with an S12 cable from the PC to the SDA100 controller configured as a passive listener. I think you are suggesting that I use the Data Out port and the more complete SteppIR controls in the Other tab. Can I still use the S12 cable and simply switch connections?
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George O'Brien, AB4FH

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Also, I am using the PTT output from the SDA to the TX REQ input of the F6700. Hence, making use of the TX REQ as I thought it was intended.
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KY6LA - Howard, Elmer

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I am not familiar with the S12 cable as I made my own about 10 years ago....  But I recall that it was a simple cable with Ground, Data in and Data out.
http://k5fr.com/ddutilwiki/images/Cables.pdf

I use the Data Out Port on the SD-100 and the complete SteppIR controls on the Other Tab

Works great and protects my Amp and Antenna by inhibiting transmit in software
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dl9eri/oe9eri

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I can confirm, that the TX REQ (TX-inhibit) does not work in CW-Mode on the 6500. Using here an old TenTec HerculesII QSK-amplifier with Microham Stationmaster for Bandswitching and PA-timing.
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KY6LA - Howard, Elmer

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I have an earlier version of the SDA-100 with an external N8LP PTT relay in between the TX port on the 6700 and the PTT port on my 2K-FA

I actually use both hardware and software to protect the Amp and the SteppIR
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George O'Brien, AB4FH

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Thanks Helmut and Howard for both your help. I will take a closer look at the interfaces tomorrow. FWIW I think it's still a good idea to fix the bug in SmartSDR since the other modes work just fine.