[1000mp] ARB-704 and Yaesu Mark V

[Scott Manthe]

Try using a switching circuit that draws 1 amp with the Mark V's relay 
and see how long it lasts. I doubt you'd get through a couple dozen QSOs.

The manual can say what it wants, and it's even possible that the relay 
could handle 500mA at 100V or  even 1 amp at 30 volts, but in either 
case, it probably won't do it very long.

Replacing those relays isn't fun and the cost of a buffer is cheap 
insurance, unless of course it's more important to you to be right than 
safe.

73,
Scott, N9AA

Art Searle W2NRA wrote:
> Hi,
>
> According to the MrkV Field manual for non-QSK switching: 
>
> MrkV Field manual page 14: With the relay now enabled, the MARK-V FT-1000MP
> Field can support non-QSK linear T/R switching voltages up to 100 VAC @ 500
> mA, or DC voltage up to 60 V @ 200 mA, or closed-circuit current up to 1 A
> with DC voltage up to 30 V.
>
> and in my Ameritron AL-800 manual:
>
> AL-800 manual page 5: Relay:
> Requires contact closure or sink of +12 Vdc at 100 mA. Back pulse protected.
>
> This seems well with specs, right?
>
> 73 Art W2NRA
>  
>
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
> On Behalf Of Pete Smith
> Sent: Tuesday, November 28, 2006 01:37 PM
> To: All about Yaesu 1000mp
> Subject: Re: [1000mp] ARB-704 and Yaesu Mark V
>
> Well, you could always RTFM, but why spoil your fun?  The info on this is on
> page 12 of the Mk5 manual, but the short answer is that you can indeed
> damage the radio - though perhaps not with the AL-80B.  
>
> 73, Pete N4ZR
>
> At 12:41 PM 11/28/2006, you wrote:
>   
>> Why you need the ARB-704
>>
>>
>>
>> Amplifiers can damage radios if the amplifier has too much relay control
>> voltage, voltage spikes, or excessive current on the relay control line.
>> Such damage often appears as "stuck" or "sticky" transmit relays in
>>     
> exciters
>   
>> or shorted transistors on transmit control lines. In most cases where the
>> radio is damaged, the system transmits normally but the external amplifier
>> stays locked in a "transmit" mode. This prevents receive signals from
>>     
> coming
>   
>> through the amplifier with normal levels whenever the amplifier is in the
>> "ON" or "OPERATE" position.
>>
>>
>>
>> Above is the reason I have placed the ARB-704 between my Yaesu Mark V and
>>     
> my
>   
>> AL-80B.  However I was told that the Yaesu Mark V will not allow this type
>> of damage to occur and my having the buffer between the rig and the amp is
>> overkill.  What is the real true?
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> -- 
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>>
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