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@contesting.com>
To: <yaesu@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@verizon.net>
> To: yaesu@contesting.com
> Subject: [Yaesu] FT890 strange behavior
> Message-ID: <15776219.828880.1373513530258.JavaMail.root@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@subich.com>
> To: yaesu@contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID: <51DE2CC5.7000804@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@contesting.com
>> http://lists.contesting.com/mailman/listinfo/yaesu
>>
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 11 Jul 2013 03:43:00 -0400
> From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
> To: yaesu@contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID: <51DE6204.8040104@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@verizon.net>
> To: yaesu@contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID:
> <1285618712.756880.1373542397974.JavaMail.root@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@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/yaesu
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 11 Jul 2013 06:52:23 -0700
> From: "Earl Morse" <kz8e@wt.net>
> To: "Michael Tortorella" <w2iy@verizon.net>
> Cc: yaesu@contesting.com
> Subject: Re: [Yaesu] FT890 strange behavior
> Message-ID: <20130711065223.CBC04760@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@verizon.net wrote:
>
> From: Michael Tortorella <w2iy@verizon.net>
> To: yaesu@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/yaesu
>
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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> ------------------------------
>
> End of Yaesu Digest, Vol 127, Issue 2
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