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Author Topic: TS850 and ARB-702k Buffer Relay  (Read 3408 times)
W6SLB
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Posts: 4




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« on: December 07, 2006, 12:13:48 PM »

   Im running a Kenwood TS-850 and have just ordered a Ameritron AL 811h. I already had the kenwood relay buffer by Ameritron (ARB-702K). My question is this...Do i need to run 12v (aprox 150ma needed) to the ARB-702K (it has a input on the device for 12v)or does the TS-850 supply enough voltage and ma.
   I ask this for two reasons..I called Ameritron and they say the 850 does supplies enough current so as not to need the external 12v power to the buffer relay. Since the manual for the relay says "if" radio supplies enough voltage DO NOT use an external 12v feed to the buffer relay. Just to make sure i called Kenwood and of course they give me a total different answer and said external 12v is needed for the ARB-702k buffer relay.
   So, i ask you folks who may be running a ts 850 with one of these Ameritron buffer relays... Do you use 12v off your power supply or straight from the 8 pin plug/cable off the buffer relay?
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K0BG
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« Reply #1 on: December 07, 2006, 01:57:34 PM »

If you use the buffer, you'll net the wall wart.

Alan, KØBG
www.k0bg.com
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KA5N
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« Reply #2 on: December 08, 2006, 03:05:55 AM »

The confusion is that you/they are talking about two different things.  One, can the TS-850 operate the keying circuit of the amp without the Buffer?  The other is that if you use an ARB-702K buffer you must supply external power for it.  The buffer contains active devices which use 12 volts, with no external 12 volts it is a dead as a doornail.  Most older Kenwoods have a built-in relay which can handle about 100 ma current without a problem.  The buffer relay is cheap insurance against possible damage to the TS- 850 which would be more difficult and costly to repair than the total cost of a new buffer relay.
In other words cheap insurance that requires external power!
GL Allen KA5N
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AD5X
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« Reply #3 on: December 08, 2006, 05:28:52 AM »

The ARB-702 only draws 1ma/volt from your radio - i.e. 12ma from 12V etc.  Not 150 ma.  IT will switch relays requiring up to 200ma at up to 200V.  So it should run fine from the accessory connector on your transceiver - i.e. no external power supply is needed if your transceiver provides 3-30 volts on the accessory connector that the ARB-702 is connected to.  I have the ARB-704 (newer model but basically the same circuit) that I have used with an IC-706MKIIG, an IC-7000, and a Yaesu MKV.  In all cases, power comes from the radio.

Phil - AD5X
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KA5N
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« Reply #4 on: December 08, 2006, 08:23:44 AM »

Power supplied from the acessory connector of a transceiver is power that is "external to the ARB-702K."
Allen
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W6SLB
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Posts: 4




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« Reply #5 on: December 17, 2006, 10:43:42 PM »

  Turns out i needed 12v going into the 12v plug on the buffer relay. The TS850 wouldnt key the amp with the buffer relay in the middle without it.
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