[Yaesu] Yaesu Digest, Vol 127, Issue 2

Thu Jul 11 13:56:40 EDT 2013

1. Connect a dummy load instead of the antenna..This will eliminate possible RF feedback to the xceiver.

2.Use another power supply..Looks like power supply fault and/or partial short in radio.

----- Original Message ----- 
From: <yaesu-request at contesting.com>
To: <yaesu at contesting.com>
Sent: Thursday, July 11, 2013 9:00 AM
Subject: Yaesu Digest, Vol 127, Issue 2

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> Today's Topics:
> 
>   1. FT890 strange behavior (Michael Tortorella)
>   2. Re: FT890 strange behavior (Joe Subich, W4TV)
>   3. Re: FT890 strange behavior (Roger (K8RI))
>   4. Re: FT890 strange behavior (David Robbins)
>   5. Re: FT890 strange behavior (Earl Morse)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 10 Jul 2013 22:32:10 -0500 (CDT)
> From: Michael Tortorella <w2iy at verizon.net>
> To: yaesu at contesting.com
> Subject: [Yaesu] FT890 strange behavior
> Message-ID: <15776219.828880.1373513530258.JavaMail.root at vznit170080>
> Content-Type: text/plain; charset=UTF-8
> 
> Hi all, using an FT890 with Astron SS-30M supply and DX Lab Suite. Receives FB but the instant I hit the key, the xcvr shuts off, the supply voltage goes down to 3 volts. Turn everything off, restart, same deal: receives FB, as soon as I hit the key, the xcvr shuts off and supply goes to 3V. At first I thought it was RF getting into the supply so I separated the two by a couple feet and this _seemed_ to help. But tonight the problem is back fully.
> 
> This first happened two days ago. Then last night everything was fine, worked several stations OK. Tonight, problem. Has anyone seen anything like this before? Any advice greatly appreciated.
> Thanks and 73
> Mike W2IY
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Wed, 10 Jul 2013 23:55:49 -0400
> From: "Joe Subich, W4TV" <lists at subich.com>
> To: yaesu at contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID: <51DE2CC5.7000804 at subich.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> 
> Sounds like common mode RF on the feedline is triggering the over-
> voltage protect (crowbar) in the power supply.  Were you on a
> different frequency/band than normal?
> 
> Best thing you can do is install a common mode choke - see the info
> in the first article here: http://www.audiosystemsgroup.com/publish.htm
> Also read the articles on "Transmitting chokes."
> 
> 73,
> 
>    ... Joe, W4TV
> 
> 
> On 7/10/2013 11:32 PM, Michael Tortorella wrote:
>> Hi all, using an FT890 with Astron SS-30M supply and DX Lab Suite.
> Receives FB but the instant I hit the key, the xcvr shuts off, the
> supply voltage goes down to 3 volts. Turn everything off, restart, same
> deal: receives FB, as soon as I hit the key, the xcvr shuts off and
> supply goes to 3V. At first I thought it was RF getting into the supply
> so I separated the two by a couple feet and this _seemed_ to help. But
> tonight the problem is back fully.
>>
>> This first happened two days ago. Then last night everything was
>> fine,
> worked several stations OK. Tonight, problem. Has anyone seen anything
> like this before? Any advice greatly appreciated.
>> Thanks and 73
>> Mike W2IY
>> _______________________________________________
>> Yaesu mailing list
>> Yaesu at contesting.com
>> http://lists.contesting.com/mailman/listinfo/yaesu
>>
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Thu, 11 Jul 2013 03:43:00 -0400
> From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
> To: yaesu at contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID: <51DE6204.8040104 at rogerhalstead.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> On 7/10/2013 11:55 PM, Joe Subich, W4TV wrote:
>>
>> Sounds like common mode RF on the feedline is triggering the over-
>> voltage protect (crowbar) in the power supply.  Were you on a
>> different frequency/band than normal?
>>
>> Best thing you can do is install a common mode choke - see the info
>> in the first article here: http://www.audiosystemsgroup.com/publish.htm
>> Also read the articles on "Transmitting chokes."
> 
> My choice would be to pitch the Astron switching supply.  The old 
> supplies work fine, but I've gone through a number of their switchers.
> 
> Common mode chokes may work, but I think it's a basic problem with the 
> supply.
> 
> 73
> 
> Roger (K8RI)
> 
> 
>>
>> 73,
>>
>>     ... Joe, W4TV
>>
> 
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Thu, 11 Jul 2013 06:33:17 -0500 (CDT)
> From: David Robbins <k1ttt at verizon.net>
> To: yaesu at contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID:
> <1285618712.756880.1373542397974.JavaMail.root at vznit170070>
> Content-Type: text/plain; charset=UTF-8
> 
> 
> the physical distance between the radio and the supply is not a factor, it is either rf being picked up by the cables to the supply or the radio is overloading it and it is shutting down.  now normally that supply should handle that radio, but if there is rf getting back into the radio it could be drawing excessive current.
> 
> two key things you don't describe are the antenna and ground system... start there.
> 
> brute force fix... clamp on ferrites on power leads to and from the astron and also on the antenna, mic, and any other connections to the radio.
> 
> Jul 10, 2013 11:36:09 PM, w2iy at verizon.net wrote:
> 
> Hi all, using an FT890 with Astron SS-30M supply and DX Lab Suite. Receives FB but the instant I hit the key, the xcvr shuts off, the supply voltage goes down to 3 volts. Turn everything off, restart, same deal: receives FB, as soon as I hit the key, the xcvr shuts off and supply goes to 3V. At first I thought it was RF getting into the supply so I separated the two by a couple feet and this _seemed_ to help. But tonight the problem is back fully.
> 
> This first happened two days ago. Then last night everything was fine, worked several stations OK. Tonight, problem. Has anyone seen anything like this before? Any advice greatly appreciated.
> Thanks and 73
> Mike W2IY
> _______________________________________________
> Yaesu mailing list
> Yaesu at contesting.com
> http://lists.contesting.com/mailman/listinfo/yaesu
> 
> 
> ------------------------------
> 
> Message: 5
> Date: Thu, 11 Jul 2013 06:52:23 -0700
> From: "Earl Morse" <kz8e at wt.net>
> To: "Michael Tortorella" <w2iy at verizon.net>
> Cc: yaesu at contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID: <20130711065223.CBC04760 at m0005309.ppops.net>
> Content-Type: text/plain; charset="UTF-8"
> 
> Rather than pile $25 worth of ferrite and filters on it why not take a divide and conquer systematic approach to resolving the problem.
> 
> Start with the supply.  Can you draw 20-30 Amps out of it with just a plain resistive load?  If not, the supply may be defective without even adding the RF part into the equation.
> 
> Next add the radio without all the microphones, CAT interfaces, external speakers, etc connected.  Transmit into a dummy load at a low power level.  Do you notice the issue?  Check all bands.  If the issue is still non existent increase power and repeat checking all bands.  Check CW and Modulated modes.  
> 
> If the issue is still not recurring start adding the microphones, head phones, speakers etc back into the equation and recheck functionality to see what it takes to make that power supply fold up.  
> 
> The final stage will be adding the antenna and transmitting full power with everything hooked up.
> 
> Once you know exactly what it takes to make the supply fold up it is going to be much easier to determine the exact fix.  Adding a ferrite bead (what mix??) to attenuate common mode currents when you are uncertain about which frequencies or which cables are even causing the issue (1.8-30 MHz is a big chunk of spectrum)is more of an exercize in how lucky you are rather than how good you are.
> 
> Good luck with the process.  Let us know how it comes out.
> 
> Earl
> N8SS
> 
> --- w2iy at verizon.net wrote:
> 
> From: Michael Tortorella <w2iy at verizon.net>
> To: yaesu at contesting.com
> Subject: [Yaesu] FT890 strange behavior
> Date: Wed, 10 Jul 2013 22:32:10 -0500 (CDT)
> 
> Hi all, using an FT890 with Astron SS-30M supply and DX Lab Suite. Receives FB but the instant I hit the key, the xcvr shuts off, the supply voltage goes down to 3 volts. Turn everything off, restart, same deal: receives FB, as soon as I hit the key, the xcvr shuts off and supply goes to 3V. At first I thought it was RF getting into the supply so I separated the two by a couple feet and this _seemed_ to help. But tonight the problem is back fully.
> 
> This first happened two days ago. Then last night everything was fine, worked several stations OK. Tonight, problem. Has anyone seen anything like this before? Any advice greatly appreciated.
> Thanks and 73
> Mike W2IY
> _______________________________________________
> Yaesu mailing list
> Yaesu at contesting.com
> http://lists.contesting.com/mailman/listinfo/yaesu
> 
> 
> 
> 
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> 
> End of Yaesu Digest, Vol 127, Issue 2
> *************************************