Experience and practice dictates that if audio equipment picks up RF it
is not the fault of the RF generating equipment. It is more likely RF
being picked up on speaker lines and other cables, power and such that is
being detected in the audio stages, be the system on or off. Common mode
chokes on speaker lines, power lines and other audio cables is likely the
true cure.
Why did the other station not cause the problem? Can't say. I do hope
that you have each piece of the new station connected back to the power
supply ground terminal. That then is the common point ground for the
station.
I run my Omni VII or the Eagle into the Centurion amp developing full
rated output. My TV and surround system is immediately below the ham
station, the tower is 3 ft outside of the wall behind the TV and sound
system and the off-air TV antenna is side mounted on the ham tower. No
RFI at my house, any band, any mode. Also I do not use any external
station ground as the station is on the 2nd floor of a wood frame house.
All lightning protection is outside of the house and mounted on the radio
tower at the point the coax, balanced feed lines and rotor cables enter
the house.
On tuning an amp. Always tune for maximum output. Do so by advancing
drive until you attain rated PA grid current max and rated PA plate
current. Adjust TUNE for maximum output and LOAD for rated grid current,
thus more loading = less grid current. With the Centurion the marks on
on the PA plate and PA Grid meters are very clear as to the maximum value
allowed. The Centurion will attain rated output with anywhere between 80
watts to 100 watts of drive. It will vary band to band.
If you wish to operate at a lower power then simply reduce drive. NEVER
retune the amp for lower power.
73
Bob, K4TAX
> Sorry changed the subject line since the subject has changed...
>
> This comes at a time when I am trying to make sense of some problems with
> my
> station. I'm a recent Ten-Tec convert having bought a used Orion II and
> Centurion amp. Was using a Yaesu FT-1000MP MKV and a modified Clipperton
> L
> prior. Since putting the Ten-Tec gear online my wife is complaining that
> I
> am coming through many different things in the house (shack is in a
> separate
> building) that I never had problems with before. TV audio in two rooms
> mainly. I get complaints from her even if I am only running the rig at
> 100W
> so I don't believe the amp is a contributor other than making the problem
> stronger.
>
> When using the amp I drive it with 50 watts out of the rig and tune to
> 1KW
> peak out using CW dits as recommended by Ten-Tec. Amps not pushed hard
> and
> neither is the rig.
>
> My grounding system is very robust...near commercial/cellular spec for
> lightning protection and all equipment is bonded to it. Really nothing
> has
> changed in my station except the transceiver and amp. Antennas are
> resonant
> on 10 thru 20 and 40. (Force 12)
>
> I plan to put my spectrum analyzer on the air next chance I get and see
> just
> what is going out. I didn't expect this and am concerned about what the
> neighbors might be experiencing but haven't come knocking on my door as
> of
> yet.
>
> Old rig was a 200W version of the MKV run at about 125 watts into the amp
> that was tuned up tight to about 900W out. I was pushing it much harder.
> I
> never ran the rig in Class A due to the heat and stress it created on the
> finals.
>
> Any thoughts and suggestions would be appreciated.
>
> I've had no on air complaints.
>
> Thanks
>
> Cecil
> K5DL
>
> ----- Original Message -----
> From: <d.e.warnick@comcast.net>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Monday, May 14, 2012 7:36 AM
> Subject: Re: [TenTec] Top receivers
>
>
>>
>>
>> There are currently emission standards, etc. that need to be met to
>> gain
>> FCC type acceptance. If the current crop of transceivers meet these
>> specifications & there is still a problem, then the specifications for
>> FCC
>> type acceptanced may (or may not) need to be reviewed. There is a
>> specification for 'spurious emissions', as well as others. If they are
>> not
>> doing the job, then a thoroug h review of those specs may be in order.
>>
>> What we do not need is any government authority dictating engineering
>> such
>> as a specific type of component ("48v MOSFETs").
>>
>> Please, please, please allow the consumer to drive the market, and be
>> very
>> cautious about yet more government oversight where it has been proven
>> time
>> and again to increase cost without solving anything.
>>
>> Just my take.
>>
>>
>>
>> We could solve a lot of issues on the air by better educating those
>> among
>> us who overdrive, tune improperly, overprocess, and run fa r more power
>> than necess ary. (Yes, I do use a linear when necessary.) In the
>> current
>> Yemen & Somalia DXpeditions, I have had far more issues with bad
>> operators
>> than with bad signals. (If I hear UP, LID, or worse one more time, I
>> think
>> I'll scream). I have shut down & walked away several times, even though
>> I
>> need the band. My choice, but that's not the ham radio that I have
>> enjoyed
>> for more than 45 years, and I choose to not let it become that. There
>> are
>> guys calling without a break even though a contact is in progress. If
>> you
>> want more government intervention, fund the FCC's enforcement branch to
>> clean this up. (No, I don't really want that either but something has
>> got
>> to give).
>
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>
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