: flexradio@flex-radio.biz
Subject: Re: [Flexradio] 144 and 432 - Low vs High Power Design
What is so wrong with an intermediate amplifier? I have been using this
approach for over 25 years. If properly designed it should produce a
very nice and clean signal.
73 Maarten N1DZ
Quoting [EMAIL PROTECTED], on Wed 02 Jul 2008 06:53:18 PM PDT:
Jim,
As an owner of four Lunar-Link tube amps driven by DEMI high-power
transverters, I have to agree with Mike. 50 watts of available drive
power from the transverter is considerably more convenient than adding a
brick amp
I suggest that there are two important issues to consider:
1) Power output. I have a strong preference for 50-60 watts - that allows
driving of a 13db triode to 1kw. Intermediate amplifiers are undesirable.
2) Stability - for digital modes standard crystal oscillators are not stable
enough. I
Phone: 512-535-4713
- Original Message -
From: David Hilton-Jones [EMAIL PROTECTED]
To: flexradio@flex-radio.biz; John [EMAIL PROTECTED]
Sent: Wednesday, July 02, 2008 1:23 AM
Subject: Re: [Flexradio] 144 and 432 - Low vs High Power Design
I suggest that there are two important issues
On Jul 1, 2008, at 11:23 PM, David Hilton-Jones wrote:
I suggest that there are two important issues to consider:
1) Power output. I have a strong preference for 50-60 watts - that
allows driving of a 13db triode to 1kw. Intermediate amplifiers are
undesirable.
You also want lower
Quoting Brian Lloyd [EMAIL PROTECTED], on Wed 02 Jul 2008
12:40:10 PM PDT:
On Jul 1, 2008, at 11:23 PM, David Hilton-Jones wrote:
I suggest that there are two important issues to consider:
1) Power output. I have a strong preference for 50-60 watts - that
allows driving of a 13db triode
On Jul 2, 2008, at 1:33 PM, Jim Lux wrote:
Quoting Brian Lloyd [EMAIL PROTECTED], on Wed 02 Jul 2008
12:40:10 PM PDT:
On Jul 1, 2008, at 11:23 PM, David Hilton-Jones wrote:
I suggest that there are two important issues to consider:
1) Power output. I have a strong preference for 50-60
Subject: Re: [Flexradio] 144 and 432 - Low vs High Power Design
[SNIP}
I would think that a modern UHF amp building block wouldn't use a
+47dBm (50W) drive... even a watt seems like a lot. In the microwave
area, a HPA gain of 40 or 50 dB (e.g. 0dBm in for 100W out) isn't
unusual
transverters, it was a
sigh of relief for me to be able to eliminate those pesky intermediate
brick amps. I'm sure others have had similar experiences.
73,
Dan KB5MY/6
Subject: Re: [Flexradio] 144 and 432 - Low vs High Power Design
[SNIP}
I would think that a modern UHF amp building block
KB5MY/6
Subject: Re: [Flexradio] 144 and 432 - Low vs High Power Design
[SNIP}
I would think that a modern UHF amp building block wouldn't use a
+47dBm (50W) drive... even a watt seems like a lot. In the microwave
area, a HPA gain of 40 or 50 dB (e.g. 0dBm in for 100W out) isn't
: Wednesday, July 02, 2008 3:40 PM
To: David Hilton-Jones
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] 144 and 432 - Low vs High Power Design
On Jul 1, 2008, at 11:23 PM, David Hilton-Jones wrote:
I suggest that there are two important issues to consider:
1) Power output. I have
I have received quite a few emails [direct and via the reflector] regarding
the subject above. Thank you for your input and recommendations. Let me
iterate my earlier post for those not familiar with this tread.
The transverter design is a work in progress. And, even though our original
intent
Thanks for the info, John.
To add my $0.02 - I use the high-power versions of the DEMI 144, 222, 432
XVTRs to drive a matching set of Lunar-Link amps, which have about the
lowest drive requirements of the 2-hole GG triode amps. My L-L's are set
up for about 2850V B+, key-down, and require approx
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