"AirRadio" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Jim, Thanks for the note, Yes I fully understand the carrier input etc, what
I meant to say and put it badly was by how much was 100w too much, I did
guess that 25-30w input was probably about right. maybe much less. I have a
Collins ART-13 which I use regularly on AM nets and wondered how much I
would have to attenuate it to run a sensible output with the Drake. Maybe it
is not worth it but possibly if the Drake puts out a significant carrier, I
was aiming for roughly 300w carrier maybe that is pushing the L-4b too hard,
regards Max
----- Original Message -----
From: "Jim Shorney" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, December 16, 2007 7:51 PM
Subject: Re: [drakelist] L-4B on AM
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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On Sun, 16 Dec 2007 18:18:29 -0000, AirRadio wrote:
Hi gang, Has or does anyone run an L-4B on AM, if so what is the max
output to the antenna expected with 100w carrier input, having said that
is 100w too much for the input, regards Max
Yes, 100 watts is too much. You need to understand the PEP-to-carrier
ratio
involved with AM. The manual states that with 100% modulated AM (I assume
this to mean full-carrier, both sidebands), the transmitter should be
adjusted to produce 500 watts DC plate input in the amplifier. This
translates to 250-300 watts carrier output. If you are using a Drake
controlled-carrier AM transmitter, adjust everything per manual specs and
you
should be OK, but in any case do not exceed the maximum PEP ratings of the
amplifier or the maximum legal limit allowed by your licence, whichever is
lower.
I'm sure one of the gurus who lurk here will come up with a more complete
answer...
73
-Jim
--
Ham Radio NU0C
TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
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