[R-390] R-390 Problems

[Mark Huss]

Tried a new Antenna with better MW reception than the Inverted L I 
currently use. The RF feed on the new antenna also provides power to the 
preamp in the antenna. Simply unhooked the lead-in from the transformer 
at the base of the Inverted-L, and hooked it to the new antenna. Results 
were less than i expected. Stations weaker than when it was on the 
bench. Examination with the meter showed that voltage was not getting to 
the antenna. Result: The cable had gotten yanked some time ago, 
resulting in the center conductor getting broken inside the connector. 
Lesson Learned; Ohm out the Antennas every few months to make sure the 
feedline is not open!

Roy Morgan wrote:

> At 09:39 PM 9/12/2006, ToddRoberts2001 at aol.com wrote:
>
>> ...RG-8X jumper that I purchased at Radio Shack... a bad connection 
>> in one of the PL-259's. There must be a moral in here somewhere.
>>
>> David
>> KC2JD
>>
>> ... The hot lead in the UG-970/U was open circuit and no way to fix 
>> it. We
>> threw away the bad connector. Problem solved. 73 Todd WD4NGG
>
>
> Todd, David and others,
>
> The topic of Rat Shack products,, and a defective UG-970 remind me of 
> low cost PL-259 "L" adapters. Some time ago it was reported that these 
> things (source unknown to me but likely "the Shack") were made with 
> SPRINGS connecting the two ends of them. The spring formed an 
> inductance that heated up during even moderate power transmit 
> operation, caused a change in the impedance seen by the transmitter, 
> and led to failure of the thing. Dissection after failure revealed the 
> bogus construction.
>
> Use good stuff. It pays off.
>
> Roy
>
>
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
> 13033 Downey Mill Road, Lovettsville, VA 20180
> Phone 540-822-5911 Cell 301-928-7794
> Work: Voice: 301-975-3254, Fax: 301-975-6097
> roy.morgan at nist.gov --
>
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