[Kenwood] TS-180S Mystery

[Dave Edwards]

Well, connect to a dummy load, and see if you can load up!

....Dave


----- Original Message ----- 
From: "Oscar Quintanilla" <oquint1 at gmail.com>
To: "Rob Stampfli" <rob at cboh.org>
Cc: <kenwood at mailman.qth.net>
Sent: Friday, May 21, 2010 7:01 PM
Subject: Re: [Kenwood] TS-180S Mystery


> Rob,
> The other end of the antenna is a straight dipole. No balun at all so
> the open reading makes sense.
> I made some voltage readings and found some interesting things.
>
> Ground disconnected
> Chassis to Antenna shield 58VAC
> Chassis to Ground 38VAC
> These readings are the same for the center conductor of the radio and
> are very low current type voltages.
> The power supply is clean with no AC on the main DC input.
>
> Welcoming thoughts on this.
>
> Oscar
> KF6YB
>
>
> Rob Stampfli wrote:
>> Actually, I rather suspect the opposite, since Oscar has already
>> tested for a short and found none.  (I presume this means he does
>> not employ a balun, since this should show up as a DC short.)  But,
>> consider this: If the point where the center conductor of the coax
>> attaches to the antenna (at the other end of the coax) opens up,
>> then the feedline itself will serve as a random-length wire antenna
>> against ground as long as it is only partially inserted.  But, once
>> the outer sheath makes contact, the inner conductor then becomes
>> shielded and it no longer functions as an antenna.  The fact that
>> two antennas behave identically is a bit strange, but I'd want to
>> find out what is going on at the other end of the coax.
>>
>> Rob
>>
>> On Fri, May 21, 2010 at 02:15:55PM -0700, Kenneth G. Gordon wrote:
>>
>>> What you have described is completely normal.
>>>
>>> Either your coax connector or the coax itself is shorted.
>>>
>>> Ken Gordon W7EKB
>>>
>>>
>>> On 21 May 2010 at 13:16, Oscar Quintanilla wrote:
>>>
>>>
>>>> Here is a mystery for your weekend.
>>>> My TS-180S got powered up after the winter and seems to have developed 
>>>> a
>>>> strange anomaly.
>>>>
>>>> When the center conductor of the antenna feed is connected to the
>>>> connector on the rear of the radio everything seems to be fine; the
>>>> receiver is very sensitive and loud.
>>>> However; when the ground or outer conductor of the PL259 connector is
>>>> contacted, the receiver goes numb.
>>>>
>>>> I measured the antenna for a short but found none. I then connected a
>>>> separate antenna and found the same effect.
>>>> I have not attempted transmitting of course and have checked all other
>>>> possible settings.
>>>>
>>>> Any ideas are appreciated.
>>>>
>>>> Oscar
>>>> KF6YB
>>>>
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>
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