[Icom] 746PRO- need a simple test.

Fri, 14 Feb 2003 04:45:26 -0800

It is described in the instruction manual as an Input/output pin. (HF/50 
MHz only)  Goes to ground when transmitting. When grounded, transmits.
Marsh

Guillermo wrote:

>	I don't have schematic, but for my reading I understand it is for an
>external means of switch the rig into Tx state, (an input signal), is
>it?.
>
>Best regards
>Guillermo - LU8EYW.
>
>Marsh Parker escribi�:
>  
>
>>  I built a circuit to allow having a seperate receive antenna for the
>>746PRO.
>>Anyway, can someone measure the HSEND voltage on ACC1 or ACC2 when the
>>PTT on the microphone is pressed?  I am pretty sure it behaved the way I
>>felt, ie going to gnd when pressed. It now does not go to gnd.   Icom
>>disagrees.. see the  e-mail below.
>>Thanks,
>>Marsh, NC7V
>>[email protected]
>>
>>-------- Original Message --------
>>Subject: RE: IC-746PRO problerm
>>Date: Wed, 12 Feb 2003 14:29:14 -0800
>>From: "Amateur Tech Support" <[email protected]>
>>To: "Marsh Parker" <[email protected]>
>>
>>Good Afternoon...
>>
>>Thanks for your e-mail.
>>
>>>From your description, the radio is operating as is should.  The HSEND is for externally keying the radio and should not go to ground if the PTT button is pushed.  It will go to ground when other features are engaged since they are part of the SEND keying circuit.
>>
>>Best Regards;
>>
>>Mike
>>
>> -----Original Message-----
>>From:   Marsh Parker [mailto:[email protected]]
>>Sent:   Sunday, February 02, 2003 11:56 AM
>>Posted To:      Amateur
>>Conversation:   IC-746PRO problerm
>>Subject:        IC-746PRO problerm
>>
>>I have an IC-746PRO which was working fine until a day or two ago. It is
>>still under warrenty until 2/20/2003.
>>SN 001739.
>>
>>I was using pin 3 of ACC(1)  HSEND, to control a transistor  which in
>>turn controled a relay.
>>
>>At this time, HSEND behaves properly, ie goes to ground when
>>transmitting except when using the microphone PTT.  The mic PTT goes
>>into transmit OK and keys the send control jack but does not force HSEND
>>to ground.  The TRANSMIT button on the front panel , the VOX in SSB and
>>CW keying semi-break in all force HSEND to ground.  Also grounding HSEND
>>causes the rig to go into transmit OK.
>>
>>I have the service manual and I am unable to account for this behavior.
>>I must have caused something to fail..
>>Any suggestions on what part(s) might be damaged.?
>>
>>Thank you,
>>Marsh Parker, NC7V
>>
>>----
>>Your Moderator: Dick Flanagan W6OLD, [email protected]
>>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>>Icom FAQ: http://www.qsl.net/icom/
>>    
>>
>----
>Your Moderator: Dick Flanagan W6OLD, [email protected]
>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>  
>