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Re: Can you run a Nautel Xmtr at 110%?
To: CRTech <crtech@crtech.org>
Subject: Re: Can you run a Nautel Xmtr at 110%?
From: Tommy Gray <tommygray@earthlink.net>
Date: Wed, 9 May 2018 12:40:19 -0500
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In-reply-to: <CAP2sdag_gvw5GSyU=nfZddWnxA3YpbATugNZ=5XJFuhoBw0YmQ@mail.gmail.com>
References: <CACci8U7uvp_3YKNoramtLS2H8nndsdRXb+hYc4mfm7Pt=9=DOw@mail.gmail.com> <1525876439.751226521@apps.rackspace.com> <001c01d3e7a4$30f4aab0$92de0010$@icloud.com> <CACci8U4=B4TMy-NjxX9Gp=R3A+NG6ELnjzExFUUy9TF8B3xZpg@mail.gmail.com> <alpine.WNT.2.10.1805090926570.3996@Lyle-Dell-D630> <CAP2sdag_gvw5GSyU=nfZddWnxA3YpbATugNZ=5XJFuhoBw0YmQ@mail.gmail.com>
Most Nautel transmitter will tell you in the manual what it’s power range is and it is usually over 100% on the top end.  I have a translator that requires 304w and a VS300 have been running at the level for some time reliably.  Check the manual for what yours should do.

Blessings!

Tommy Gray CPBE CBNE


On May 9, 2018, at 12:00 PM, Gary Liebisch <glieb01@gmail.com> wrote:

We get that question all the time and you can certainly run it at 110%.   In the days before software was used to limit power, it was common for folks to use all kinds of modifications and tricks to "juice up" tube transmitters beyond their rated power. But now software is the gate keeper on excess dissipation, and our components are conservatively rated.  You get best efficiency on a solid state transmitter when it is run at rated power or above.  If your licensed TPO is 5500 w and you follow the advice of buying the next larger transmitter (a 7.5) then you are taking a double hit on efficiency, not running it near rated power, not to mention that a 7.5 is really a 10 internally anyway, so you're only at about 50%.   We may not talk you out of doing that, though, because it puts more commission in our pockets!  :)

Gary Liebisch
NAUTEL

On Wed, May 9, 2018 at 12:37 PM, RADIO DOCTOR <lylehenry@fastmail.fm> wrote:
Since 9.8kW ERP is plenty, why not 9.0, or 8.45 (half of 16.9)?  The difference from 9.8 won't be noticeable, the transmitter won't be pushed to the limit, and you're not spending more on antenna, bigger transmssion line, etc.


On Wed, 9 May 2018, Dave Land wrote:

It's a new station, no license yet, we're sizing everything now, we could
run up to 16.9KW but thinking that 9.8 KW will be plenty. To do that we'd
need to run the 5.5KW.
Dave

On Wed, May 9, 2018 at 9:44 AM, <nathaniel.steele@icloud.com> wrote:

IF Nautel says it will do 5500W, then it should be fine, a transmitter
isn’t a car, in other words, a transmitter runs at a set power level 100%
of the time, it’s not stopping at red lights, or going up or down hills……so
if the manufacturer says it will do 5500W, it would be used at 5500W full
time.



That said my inclination would be to go to the next bigger transmitter,
which I think is a 7.5. That way When an RF module fails, you stand a
better chance of making (closer to) licensed power while it gets repaired.


Now the better question is, what is your licensed ERP, how much and what
size transmission line, type of antenna, and any filters. In other words
Have you calculated how much transmitter you need? This statement makes me
wonder “Management wants to run it a full output for a max ERP.” Because
MAX ERP is your LISCENSED ERP.



*From:* Laverne Siemens <lsiemens@goldenwestradio.com>
*Sent:* Wednesday, May 09, 2018 9:34 AM
*To:* CRTech <crtech@crtech.org>
*Subject:* RE: [CRTech] Can you run a Nautel Xmtr at 110%?



As long as you have a good load, proper cooling and aren't exceeding your
licensed ERP...you should be fine at 5500 watts.



Laverne



-----Original Message-----
From: "Dave Land" <dave@klvv.com>
Sent: Wednesday, 9 May, 2018 9:30am
To: "CRTech" <crtech@crtech.org>
Subject: [CRTech] Can you run a Nautel Xmtr at 110%?

We're looking into getting a new Nautel 5KW transmitter. They are rated
for a max output of 5500 watts. Management wants to run it a full output
for a max ERP. Is that something you have done? or would even consider?

To me, it feels like I'm gonna get in my car and run full throttle 100% of
the time! Don't think it would last too long at that rate.

Dave Land

The Love Station, Inc.



FMeXtra digital SCA systems - encoders and receivers
SCA/FM/FMeXtra radios: fixed & tunable-wood cases-nice sound
Sidekick SCA generators - 67/92kHz-checked and calibrated
--------------------------------------------------------------
  Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW  Los Angeles, CA
SCA Consultant:  Brazil, China, India, Mexico, Taiwan, SE Asia
       323-660-4690 Home/Office     213-880-4690 Mobile
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References: Can you run a Nautel Xmtr at 110%?
(Dave Land <dave@klvv.com>, 9 May 2018 14:30:32 -0000)
RE: [CRTech] Can you run a Nautel Xmtr at 110%?
("Laverne Siemens" <lsiemens@goldenwestradio.com>, 9 May 2018 14:34:13 -0000)
RE: Can you run a Nautel Xmtr at 110%?
(nathaniel.steele@icloud.com, 9 May 2018 14:45:03 -0000)
Re: Can you run a Nautel Xmtr at 110%?
(Dave Land <dave@klvv.com>, 9 May 2018 14:55:45 -0000)
Re: Can you run a Nautel Xmtr at 110%?
(RADIO DOCTOR <lylehenry@fastmail.fm>, 9 May 2018 16:38:08 -0000)
Re: Can you run a Nautel Xmtr at 110%?
(Gary Liebisch <glieb01@gmail.com>, 9 May 2018 17:01:58 -0000)
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