The fcc requires amplifier gain to be 15 decibels maximum for any amatuer
radio amplifier.
What a stupid regulation! On the one hand you are allowed 1500W and on the
other only 15dB gain? It makes no sense. Presumably one of the CB
regulations.
A gain of 15 dB is reasonable for a single stage
The VRF2933 is rated 3:1 Load VSWR Capability at Specifi ed
Operating
Conditions according to its datasheet; perhaps that's why
there no
built-in ATU.
.but that doesn't mean SSB IMD would be acceptable, or
it would be safe in every circuit at that mismatch, so keep
that in mind. :-)
No
Well said tom, an often overlooked aspect is the angle of the
mismatch, load pull is the only way to tell, while a 3:1 resitive is
not to harsh, very few things will survive a 3:1 at an inductive
reactance angle. Load pull is the only way to be sure, and I would be
uncomfortable making any claims
Device web site was claiming any angle in the device specs.
(!!!???) This should be fun to watch.
73, Guy.
On Sun, Apr 18, 2010 at 9:54 AM, Matt Palmer kd8...@gmail.com wrote:
Well said tom, an often overlooked aspect is the angle of the
mismatch, load pull is the only way to tell, while a
It's pretty basic stuff Guy.
Look at what happens in this MRF150:
http://www.w8ji.com/demonstation.htm
It would be nice if there was a free lunch and we could
magically buy a device that didn't care about the load and
gave reasonable operating efficiency and good IMD with any
impedance from
@mailman.qth.net
Subject: [Elecraft] KPA500 active devices!!
There are two VRF2933's in push-pull, so they're not 750
watts each, but per pair. There are only three amps in
existance, and no devices have been destroyed (yet). Again,
500 watts is a very conservative rating. It's been key-down
There are two VRF2933's in push-pull, so they're not 750 watts each,
but per pair. There are only three amps in existance, and no devices have
been destroyed (yet). Again, 500 watts is a very conservative rating.
It's been key-down for 10 minutes withy no problems.
73, doug
The VRF2933 is rated 3:1 Load VSWR Capability at Specifi ed Operating
Conditions according to its datasheet; perhaps that's why there no
built-in ATU.
On Sat, Apr 17, 2010 at 6:44 PM, Doug Faunt N6TQS +1-510-655-8604
fa...@panix.com wrote:
There are two VRF2933's in push-pull, so they're not
At any phase angle with no signal degradation. Minimum 20 dB gain,
300 watt output 400 typical per device. So being operated very
conservatively.
On Sat, Apr 17, 2010 at 7:22 PM, S Sacco nn4x.st...@gmail.com wrote:
The VRF2933 is rated 3:1 Load VSWR Capability at Specifi ed Operating
Hi All'
Works for me..Bring it on Elecraft...!!!
Gary
On Sun, Apr 18, 2010 at 9:30 AM, Guy Olinger K2AV olin...@bellsouth.netwrote:
At any phase angle with no signal degradation. Minimum 20 dB gain,
300 watt output 400 typical per device. So being operated very
conservatively.
On Sat,
Just for curiosity, what do a pair of VRF2933 cost? Availability?
73 de Brian/K3KO
Guy Olinger K2AV wrote:
At any phase angle with no signal degradation. Minimum 20 dB gain,
300 watt output 400 typical per device. So being operated very
conservatively.
On Sat, Apr 17, 2010 at 7:22 PM, S
, 2010 6:45 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA500 active devices!!
There are two VRF2933's in push-pull, so they're not 750
watts each, but per pair. There are only three amps in
existance, and no devices have been destroyed (yet). Again,
500 watts is a very
Hi Joe
Have you seen any IMD data on these devices?
John
--- On Sat, 4/17/10, Joe Subich, W4TV li...@subich.com wrote:
From: Joe Subich, W4TV li...@subich.com
Subject: Re: [Elecraft] KPA500 active devices!!
To: 'Doug Faunt N6TQS +1-510-655-8604' fa...@panix.com,
elecraft
...@nc.rr.com wrote:
From: Brian Alsop als...@nc.rr.com
Subject: Re: [Elecraft] KPA500 active devices!!
To:
Cc: elecraft@mailman.qth.net
Date: Saturday, April 17, 2010, 4:42 PM
Just for curiosity, what do a pair of
VRF2933 cost? Availability?
73 de Brian/K3KO
Guy Olinger K2AV wrote:
At any
Digi-Key has them listed at $153.34 each (Qty 1), down to $86.67 in lots
of 1000.
They have 30 in stock, if you want to order spares early :)
73
Dave KQ3T
Brian Alsop wrote:
Just for curiosity, what do a pair of VRF2933 cost? Availability?
73 de Brian/K3KO
:42:39 +
From: Brian Alsop als...@nc.rr.com
Subject: Re: [Elecraft] KPA500 active devices!!
Cc: elecraft@mailman.qth.net
Message-ID: 4bca476f.8020...@nc.rr.com
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Just for curiosity, what do a pair of VRF2933 cost? Availability
).
73,
... Joe, W4TV
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of juergen
Sent: Saturday, April 17, 2010 7:50 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 active devices!!
Hi Joe
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