Transmit spikes
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Posted Tuesday, January 3, 2012 2:30 PM
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In the middle of December I took delivery of a new 3000. Love the receiver, but
do not get along with the transmitter.

Support ran me through all kinds of testing and interactive connections, then
sent me a replacement radio. The replacement radio has the same symptoms:

When using ANY microphone plugged into front of the 3000, there is a variable
XMIT spike that shows on my peak reading meters (two different meters at
different locations along the RF path. The start decay point runs from a few
Watts to over 60 Watts. With ANY microphone plugged in the front of the 3000 and
using a foot PTT (plugged into the rear of the 3000) there is a much smaller
spike - typically showing under one Watt or less on the meters. When keyed from
the MOX button with a mouse click, the effect is the same as the rear PTT
connection. I even purchased a new Yaesu MH-31 to test with.

If I did not have the peak reading meters I might never have noticed this
problem - then wondered why my amp smoked. Yes, the spikes cause spikes from my
tube amplifier - which can be seen when watching the meters on the amp.

The spikes occur on all bands and the antennas are well away from the house (I
live in the country). I have never had a similar problem with any other
transmitter in my 50+ years of hamming. The spikes can be seen on a remote
receiving scope, are reported to be instantaneously as strong as my SSB signal,
and are heard as a thumping sound.

To date I have spent over 40 hours configuring/reconfiguring my station,
exchanged over sixty emails with support, spent time on the telephone with
support, bought $175 of unneeded extra microphones and adapter cables, and spent
nearly $50 to return the first 3000.

The entire station is grounded per directions/recommendations of Flex. I have
tried beads on everything - plenty of them (more time and money). Various
configurations of the station have been tried - amplifier, wiring, location, and
antenna wise. At no point has the problem abated!

I have put the purchase of a solid state amplifier on hold, as I am sure this
spike will not be healthy for it.

My questions:

1. Anyone out there have a sure-fire fix for this?
2. Anyone know of other instances of spikes - (I have been lead to believe that
I am the only ham having this problem)?

Thanks,

Bill W2BLC
Post #5284
Posted Tuesday, January 3, 2012 2:55 PM
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Bill,
I have not heard of any one else with this syptom but I dont own a 3000 either...

Mostly out of curiosity...
1. Are the spike repetative or random ?
2. Do they occur with no mic plugged in and keyed only with MOX ?
3. Do they occur the a dummy load in place of antenna ?
4. Do they only occur on voice peaks ?
5. Have you tried a differnt Power Supply >


AL, K0VM
SDR-1000, Flex5000, Flex user since 2006
Post #5286
Posted Tuesday, January 3, 2012 2:59 PM
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1. The spikes are random in strength.
2. They do not occur with the mic unplugged - tried beads etc.).
3. They occur on a dummy load as well as the antenna (any of them).
4. Has nothing to do with voice - only happen when keying (initial PTT).
5. Have even tried 12 vdc from a battery.

Thanks for asking,

Bil W2BLC



Mostly out of curiosity...
1. Are the spike repetative or random ?
2. Do they occur with no mic plugged in and keyed only with MOX ?
3. Do they occur the a dummy load in place of antenna ?
4. Do they only occur on voice peaks ?
5. Have you tried a differnt Power Supply >
Post #5287
Posted Wednesday, January 4, 2012 11:20 AM
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Bill,
I'm sort of stumped too..

I assume that with the Drive control set to zero, the spike on initial key up spike is gone ?

I assume that with drive up and MIC a zero the spikes are gone ?

I assume that if you do a reset to factory defaults, (Setup>Database reset) and the absolute minimum configuration, that the spike still occur ?

Sorry if if sounds like the same stuff that Flex put you through.


AL, K0VM
SDR-1000, Flex5000, Flex user since 2006
Post #5291
Posted Wednesday, January 4, 2012 12:24 PM
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Yes - all that was tried.

Thanks for asking,

Bill W2BLC
Post #5292
Posted Wednesday, January 4, 2012 1:33 PM
Supreme Being

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it would be interesting if Flex has the same problem with your radio back at the shop?
Post #5293
Posted Wednesday, January 4, 2012 2:18 PM
Supreme Being

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Bill,
It seems to me that it is not RF related but Mic or Mic connection related.
One more think to look at..
Can you see the you see the spike on the PSDR display in the Scope Mode ?
If yes, is it still visable with Drive at 0 ?

I don't think I can be of much more help since I don't have access to at 3000.



AL, K0VM
SDR-1000, Flex5000, Flex user since 2006
Post #5294
Posted Wednesday, January 4, 2012 2:44 PM
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Bill,
I see on the reflector that you can hide the spike by setting the TX delay to 70 msec..

But I thought of a couple more questions...

Is the negative lead of your power source connected to anything other than the negative connection of the 3000? do you have any connection from the negative ( or any ) pin of you mic connector to the negative lead of you power supply ( other than internally through the 3000 ) ?



AL, K0VM
SDR-1000, Flex5000, Flex user since 2006
Post #5295
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