[TowerTalk] Antenna shift, VHF/UHF matching unit burning out

[Bill]

I have not received any...I checked my Junk folder and none in there...
Bill W2CQ


On 4/21/2014 3:30 PM, Scott wrote:
> GOOD LORD! I just opened my email and I got MORE raunchy pictures from 
> Clare and now from Jessica.
>
> WTH IS GOING ON! This has got to stop. These emails are coming off 
> this list, they have the same subjects from Towertalk.
>
> Last night I KNOW the n4jbk email from the mast slipping thread was 
> spewing porn back every time it got an email. Now ANOTHER!
>
> If I get another that's the end of Towertalk. This is stuff you don't 
> want your wife and kids seeing FOR SURE
>
> STEVE or anyone else who has keys to the list pse find out what is 
> going on here. I know the ve4 that was replying to the mast thread 
> last night was getting them also, so it's not me.
>
> Scott
> N1CX
>
> At 10:29 AM 4/21/2014, Earl Morse wrote:
>> On the Diamond it's most likely a bad connection at or in the 
>> antenna.  Or it has been damaged by a strike but not blown apart.  I 
>> found the top 3' "exploded cigar" for my vhf/uhf antenna in the woods 
>> this spring.  Guess that explains the high SWR, not that I use it 
>> that much.
>>
>> On the AV-xxx vertical I don't think it is a bias issue saturating 
>> the matching transformer/balun.  Where does the DC current go that 
>> flows through the balun (saturating it) into the antenna?  You don't 
>> have a top light or preamp on the antenna do you?
>>
>> If you have high SWR on all the bands take a look at the balun. Maybe 
>> it got overheated and smoked the core.  Some of these antennas use 
>> baluns that are designed right on the edge and work good until 
>> something else goes bad.  While the baluns are pretty efficient they 
>> can be overheated if operated outside of the design parameters.  Once 
>> the ferrite core material starts hitting the Curie temperature it 
>> stops being a core and the transformer stops working.  It can be a 
>> runaway condition in which the core eventually fails.
>>
>> Earl
>> N8SS
>>
>> ------------------------------
>>
>> At 10:23 PM 4/20/2014, Roger (K8RI) on TT wrote:
>> >I think that I've lost a ground.  The SWR has gone sky high on the
>> >Diamond 144/440 repeater antenna. As the antenna is only rated at
>> >200 watts the matching network is pretty light duty.  Also, the
>> >AV640 which originally was very easy to match, is now difficult to
>> >find the resonant points.
>> >
>> >I believe this is due to a DC bias through the matching transformers
>> >putting the cores into, or near saturation.
>> >
>> >I keep using, I think and I believe as I really don't know, but it
>> >sounds logical.
>> >
>> >The new AV840 just arrived and I need to work on the Diamond
>> >antenna, so I need to find the problem before going any farther with
>> >the antennas.
>> >
>> >I had been talking to N8ERF on the repeater when he mentioned I was
>> >getting noisy.  I immediately stopped transmitting, came in, got the
>> >SWR bridge, took it to the shop and put it in the line. The SWR had
>> >gone from 1.2:1, to off scale.  I think the finals are OK. I
>> >certainly hope so.
>> >
>> >So tomorrow, I'm going to add one of those grounding plates that tie
>> >everything together and to the station ground. The space behind the
>> >desk out there is a mass of wire, that could be neatened up, so I
>> >can see at a glance what is connected to what.
>> >
>> >That and all the projects need to be finished up so I have an
>> >organized shop in which to work.
>> >
>> >Any thoughts on the grounding would be appreciated
>> >
>> >73
>> >
>> >Roger (K8RI)
>> >
>>
>>
>>
>> _______________________________________________
>>
>>
>>
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