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On a E4438C when using a PRAM file for data I was able to add a data bit with non burst too turn off the carrier. I can not seem to do this with the N5182B using the same PRAM file. How do I turn off the RF?

Question asked by ahoock on Sep 23, 2019
Latest reply on Nov 14, 2019 by Tardz

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Using 4GFSK .modulation.

PRAM file on N5182B not behaving the same as on a E4483C.

My unit under test responds to the message, but I need the RF off at the end of the message.

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ahoock Oct 18, 2019 6:05 AM
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I have loaded the latest software but still does not work.
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Tardz Oct 20, 2019 11:29 PM
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Hi, I have an E4437B not a E4438C but, for using PRAM, I suppose that very similar or identical. You must set bit2 to enable RF or not at the RF output. There are an example below. I've done a test with basic sequence and 2FSK signal.

In this example, I set bit0 to have a marker (cyan trace), bit2 to have burst (yellow trace)

For more details about these functions TRIG and BURST:
EXTERNAL TRIG with UN8

Yves
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- ahoock @ Tardz on Oct 21, 2019 6:14 AM
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  I have the TRIG and BURST set in my file. It does work on the E4438C, I have been using it for years. We purchased a N5182B ,the recommended replacement with correct options,for the E4438C, and I loaded the same PRAM file with the TRIG and Burst bits set. The message is sent correctly as the receiver hears it, but the RF does not turn off. The carrier stays present. I loaded the latest software from July of this year which stated it fixed a bug with the Internal Burst but the problem still persists.
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  - Tardz @ ahoock on Oct 21, 2019 3:14 PM
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    Hi,
    I have two RF generators, E4432B and E4437B, option UN8 on both: with the same PRAM file, it works well on my E4437B but not on the E4432B, the carrier is still ON. The only difference between the two generators is that the UN8 option is a version A on the E4432B but version C on the E4437B. Your N5182B is much newer, and I checked the information for the PRAM command, and it's the same as the procedure. It would have worked for your E4438C as well as for your N5182B.
    I find this problem quite frustrating, in my case they are discontinued generators, I do not expect to have firmware changes, but in your case, it is a recent generator, the latest firmware is B.01.80. I guess you're not the only one with this problem, in your case I would try to contact Keysight directly for help.
    
    Yves
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  - Tardz @ ahoock on Nov 14, 2019 10:19 AM
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    Hi,
    I used a new sequence with PRAM and compare results: my E4437B is OK but for my E4432B, RF is always ON.
    I decided to use the signal EVENT1, inverted it and inserted to Ext-2 input connector and enable PULSE mode on ext 2 dc coupled option. The end of the signal EVENT1 was little short, I've add 19x code 16 before the end of last byte (208).
    I took the signal from the EVENT1 connector, I inverted it with a simple GATE inverter, and sent its output to the EXT 2 INPUT connector ... everything worked fine. I know it is a patch but it is a solution while waiting to find the cause of the problem of your generator.
    
    MEM:DATA:PRAM:LIST 85,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,21,20,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,21,21,21,21,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,208
    
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    Yves
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On a E4438C when using a PRAM file for data I was able to add a data bit with non burst too turn off the carrier. I can not seem to do this with the N5182B using the same PRAM file. How do I turn off the RF?

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