[TenTec] Paragon 585

[Bob McGraw K4TAX]

The headphone jack is a 1/4” TS jack.   So you’ll need to use mono headphones or use a 1/8” to mono 1/4” adapter for stereo headphones.   (Hate those adapter things.). 

There are isolation resistors so should something short, nothing should fry. 

Bob

Sent from my iPhone

> On Mar 9, 2021, at 2:23 PM, Ken Brown <kenradiobrown at gmail.com> wrote:
> 
> Hi Snowy,
> 
>     I tried looking at my Paragon II 586 documentation to see if I could
> answer your question. Unfortunately my manual does not have the "big
> picture" showing how all the various boards and input/output jacks are all
> connected together. So I don't know if there is a series resistor between
> the speaker output and the phone jack. And of course since mine is a 586 it
> may not be identical to the 585 anyway.
> 
>     I think whether using stereo headphones would cause any damage depends
> on two things;
> 1) whether the ring of the 1/4" stereo phone plug is left open circuit or
> grounded when plugged into the Paragon headphone jack. That depends on the
> dimensions of the phone jack.
> 
> 2) whether the headphones connect the tip and ring directly together when
> you switch them to mono mode.
> 
> If switching the headphones to mono mode connects the tip and ring together
> with no series resistance, rather than leaving the ring open circuit, and
> the jack on the radio grounds the ring, then the output of the radio's
> audio amplifier would be grounded. On the other hand most headphone jack
> circuits I have seen put a few hundred ohms in series with the hot lead of
> the phone jack. If that is the case even if the tip connector on the phone
> jack is grounded by the headphones, the audio amplifier would still only be
> loaded by a few hundred ohms, which should not damage anything. Maybe if
> you cranked the volume way up you could smoke that 1/4 watt or 1/2 watt
> resistor but I sort of doubt it.
> 
> Ken N6KB
> 
>> On Tue, Mar 9, 2021 at 3:00 AM ROLAND HOWELL via TenTec <
>> tentec at contesting.com> wrote:
>> 
>> 
>> Hi Gents
>> Just purchased a set of Kenwood HS5 headphones to use on the paragon, i
>> remember in the dim distant past that if you used a stereo jack ( or a
>> mono) in the H/P socket then you could do some damage electronically
>> speaking to the radio by using the wrong one.
>> So question is do i use a mono or stereo wired head set.
>> As usual your advice and or recommendations please.
>> 73
>> Snowy G0HZE
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