[Boatanchors] Fwd: Re: NC270 Muting

[Bill Fuqua]

>Date: Thu, 07 Apr 2011 11:37:22 -0400
>To: Dale Parfitt <parinc1 at frontier.com>
>From: Bill Fuqua <wlfuqu00 at uky.edu>
>Subject: Re: [Boatanchors] NC270 Muting
>
>   The aux. contacts on the old Dow-Key relays were great for muting.
>If you could even put them in series with the speaker if your receiver did
>not have a mute input.
>        http://www.dowkey.com/_pseries_attach/_plk13_1_60a.pdf
>These are quite expensive today but can be found at hamfest.
>73
>Bill wa4lav
>
>
>At 11:15 AM 4/7/2011 -0400, you wrote:
>>Have you looked at the schematic? The external  screw terminals appear to be
>>controlled by the standby switch- so as you put the RX in standby, those two
>>terminals are shorted for external relay operation- they are not for muting.
>>If you want to mute the RX, I would think you could rewire those terminals
>>to emulate the standby switch- a logical AND gate - (caution, there is B+ on
>>that switch) or  wire the speaker in series with those terminals and use the
>>extrernal relay to open up the speaker line.
>>
>>Dale W4OP
>>
>> > Hi Guys... Have a Natoional 270 and need to know how to mute it... It has
>> > relay screws in the rear but when shorted do not work...
>> > Any ideas????
>> >
>> >
>> > Very Best 73's
>> > Bob Peters
>> > W1PE
>> >
>> > ARRL, QCWA, AM FOREVER
>> >
>> > Money is only temporary, Radio is forever
>> > From The Old Dog
>> >
>> >
>> >
>> > _______________________________________________
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>>
>>
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