[Milsurplus] Need help with ART-13

[J. Forster]

No surprise.

I was just trying to point out that a TD relay and PTT HV switching
requires two relays...  one for each function.

-John

===============


> John,
>          Yes there is a relay actually mounted on the back side of the
> P.S.
> that is activated by the PPT. which sends HV to the set.
> Bob
> W1GTH
>
>
> ----- Original Message -----
> From: "J. Forster" <jfor at quik.com>
> To: "mac" <w7qho at aol.com>
> Cc: "BOB" <hoopmonk at snet.net>; "milsurplus" <milsurplus at mailman.qth.net>
> Sent: Tuesday, March 08, 2011 8:42 PM
> Subject: Re: [Milsurplus] Need help with ART-13
>
>
>> If this is the discussion I think it is, the delay tube was to allow the
>> filaments to heat up. The HV pimaries were driven directly from the
>> delay
>> tube and its contacts kept failing. I think Bob is adding a contactor in
>> the delay tube circuit.
>>
>> I don't think the HV is controlled by the PTT, but I could be wrong.
>> Doing
>> that w3ould require an additional, low power relay.
>>
>> FWIW,
>>
>> -John
>>
>> ================
>>
>>
>>
>>> Bob,
>>>
>>> Not quite sure why a delay would be required/desirable here.  Are you
>>> running HV into the set continuously instead of only on PTT (like the
>>> dynamotor does)?
>>>
>>> Dennis D. W7QHO
>>> Glendale, CA
>>>
>>> ***********
>>>
>>> On Mar 8, 2011, at 4:28 PM, BOB wrote:
>>>
>>>>    I run a time delay from the 115V input to kick in the 400 and 1200
>>>> volt primary's on my P.S. The 28 volt supply comes on when the main
>>>> switch
>>>> is turned on. The orginal design had the delay tube turning on the
>>>> primary's
>>>> but I found that to be a problem. I am about to install a contactor
>>>> activated by the delay to do the heavy lifting. Should work out much
>>>> better
>>>> Good luck
>>>> There is a Yahoo Art-13 site that is great for this kind of info.
>>>
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>>
>>
>
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