I have a problem with my Flex 6600 and power drop-off

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  • Updated 5 months ago
I have a problem with my Flex 6600 and power drop-off. It was first notice bya local station who said I had missed several characters when sending CW.I thought it might be SWR related, but the SWR is good. I tried it on dummy load with the same results.If I send a series of dits, you can see the power varying as the FLex is keyed. If the power drops completely I can carry on sending dits with no recovery. If I let go the paddle and start again, power is there. I am using SDR 2.6.1
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Roger Cooke

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Posted 5 months ago

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Jim KJ7S

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I will take a first stab at one potential problem, if you happen to have your transmit bandwidth too tight, then as you bounce around to make contacts, you may get close or beyond the set bandwidth and it will diminish the tx power or stop it entirely. Running digital modes for example, some may narrow the tx bandwidth down to a minimum causing a power drop at the edges of the tx signal.
If you narrow the tx bandwidth down to say 100 hz, it won't take too much of a shift in your cw frequency position to cause the drop.  Just a thought, 
Jim  KJ7S
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N9VC

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That would only be a factor if he was using modulated CW. The transmitted
bandwidth is under the tab for phone.
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bahillen

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Does the same thing happen using CWX keyboard. Try the straight key too. It may be a setting on the CW parameters. Check your power limit parameters. From your email you are not using an amplifier.


It is pretty strange. Consider filling out a help desk ticket.


73 Bill W9JJB
(Edited)
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Michael Walker, Employee

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Hi Roger 

You should open a support case.  One of the first questions they will ask is what is the health of the power supply under full load?  It sounds like the voltage is dropping and this will reduce your RF out.

You'll have to test this by using a voltmeter connected at the back of the radio (not at the power supply) while under full load.  Go into FM at 100% power into a dummy load and see if the voltage starts to sag.

Is your power supply a 25A power supply or greater?  

Mike
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Lasse Moell

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Sounds similar to what I have: https://community.flexradio.com/flexradio/topics/spuruious-no-power-output
I still see this, but reducing the transmitter hang time to go over to receive inbetween characters lessen the problem.



(Edited)
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Joe N3HEE

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I have the same problem.  Power goes to zero.  The problem is random and only happens occasionally.  I cannot reproduce the problem.  Started with version 2.5.1.  Flex 6600M.  Only noticed this when sending CW so far.
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Michael Walker, Employee

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Hi Joe

Now would be a good time to open a support case so we can look into it if you haven't already (I didn't check).

Merry Christmas 

Mike
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Dan Quigley N7HQ, 4O7HQ, Service/Support Manager

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When this occurs, please make note of both the current and voltage from your power supply.  That data will help our technicians diagnose the issue.  Also, please check your supply cables.  I've seen this symptom due to poor power connections.  The supply cable should be about 3m long or shorter, constructed of #10 AWG and terminated on the radio end with 45A Anderson Powerpole connectors.  If your connectors are warm to the touch, check and clean the contacts. 

73,
Dan
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Roger Cooke

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Thanks for the replies guys. My status:
1  I am not using a linear.
2  My power supply is a linear 40A supply and the lead is 1.5m long, very thick power cable.
3  I did some tests on dummy load. When sending a series of dots, IF the fault occurs, I can carry on sending dots ( I have tried up to a few minutes ) and the fault stays, i.e. no output at all. If I just quickly drop the paddle and restart, the power is up full again.
4  It does not seem to happen when using N1MM, for example I did both CWT periods on CHristmas day and the fault did not occur once.

Next step is to wire up my MM3 and a straight key and test those. However, it looks the same fault the Lasse has and also another local has the same problem, but has not been active over the Christmas period.  It looks to me like a soft/firmware problem. I might raise a support ticket when I have carried out the external keyer checks.
Many thanks for the replies and have an enjoyable Boxing Day.
73 de Roger, G3LDI
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Joe N3HEE

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Roger I have the same problem.  It rarely happens though.  Let me know if you can reproduce it.  I have tried but cant seem to get it to happen on demand.  I will also open a ticket once I get a better handle on whats happening.  Thanks -Joe N3HEE
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Roger Cooke

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I can reproduce it with no problem at all. It is occurring every few seconds now. |If I send a series of dots into a dummy load, it happens after 20 seconds or so. If I keep the paddle pressed the fault stays, and even changing quickly from dots to dashes the fault remains and sill STAY until I de-key. I can the key instantly again with full power until it does it again.
It happened with the MM3 keying as well, and also when using a CW key within  Logger32. I have a 40A linear power supply and it is wired correctly with heavy duty leads, about 1.5m long. I am not using a linear.
I think I shall try a reset next, before finally deciding to open a ticket, as N9VC suggests.  Power cable and connectors are cold. I was running 40w into the dummy load.The serial number of the Flex is: 2618-1546-6600-1427
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Lasse Moell

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Roger you seem to suffer a lot more than I do...  I am using V2.60 and Maestro, and it do happens every now and then but can go hours before I noticie it.  Interesting you see it when using Logger32 to key, I have yet to notice the drop-out using either N1MM or DX4Win. As you do use a dummy load it's not RF related, and only 40 w would indicate there is no over current issues.  /Lasse SM5GLC
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N9VC

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Have you tried a reset?
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Joe N3HEE

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Just had a TX power dropout on 160 meters CW calling a JA DX station.  I was in the middle of sending my call sign a couple of times and noticed the power meter on amp go dead.  Also noticed TX monitor on panadapter go dead indicating no RF output. This will happen with or without amplifier in line. Let up on the key and resent call sign without issue.  This does not happen very often so hard to recreate it. 

1. TX power was 34 watts driving Ten Tec Titan @ 1KW
2. DC power supply 13.3 volts with key down.  13.9 volts with key up.
3. DC power supply showing 12 Amps key down.
4. Using my paddles connected to radio.
5. Semi break in with delay set at 300 ms.
6. SSDR Win 10 client connected to radio.
7. FRStack and DX Labs connected to radio.

I will open a ticket.

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Lasse Moell

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Joe,
please do open a ticket ASAP! I have done so and just got this reply:
"This issue has been logged as defect number: G7759
At this time the only workaround is to stop sending and allow the radio to transition to RX and then start resending."

We are a number of hams seeing this, and hopefully it will be taken very serious if we all report the issue.
/Lasse SM5GLC
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Joe N3HEE

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I opened a ticket with Flex support yesterday.  I had it happen twice yesterday !