[Elecraft] 2-meter solid-state linear amplifiers with K3 2-meter option

[Fred Smith]

Phil

I have the internal 2m module in my K3 and just went through the same
issues. I used a single yagi an M2 2m5WL I liked the truss system much
better than the 17B2's that always fail at the truss points the M2's figured
that out. It's on a 34' boom but light weight and small wind load.

I used a mast mounted preamp with low loss coax and only fittings till the
amp. I use 2 Mirage amps the first a QRP/ HT amp 5-10w in to step the power
up to about 50w then into my Mirage B-5030-G 50w in 300w out with a true 50w
input and 14.8v with a 70 amp supply the output is 358w into my Bird
wattmeter. I have a small fan's running on top of the heat sink's on both
amps and they show no sign of over hearing during digital modes or any heavy
duty cycles. I also have a B-5016-G a 165w Mirage amp all of these are the
Black face models and have never had a problem with any of them.......almost
forgot all of the amps were purchased used online over the last 5-6 years. 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Phil Hystad
Sent: Monday, January 21, 2013 11:08 AM
To: jim at audiosystemsgroup.com
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] 2-meter solid-state linear amplifiers with K3
2-meter option

Yes,  although I did not indicate this earlier, getting a high-gain antenna
is first on my research and shopping list.  I know more about what I want
there and where to find it.  It is the amplifier part of the problem that I
was asking here.  Also, just in case someone wants to raise the issue, I am
already planning on LMR600 low-loss coax (but likely not super low loss
hardline coax).

73, phil, K7PEH


On Jan 21, 2013, at 8:59 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:

> On 1/21/2013 8:13 AM, Peter Torry wrote:
>> May I suggest that before buying an amp that you review the system that
you intend to use as money spent on a good antenna and low loss feeder are a
better investment than an amp.
> 
> Excellent suggestion, Peter.The difference between 5 watts and 160 watts
is 15 dB.  It's not too difficult to achieve 10 dB or more of gain with a 2M
Yagi of manageable size, to gain another 10dB by getting it high in the air,
and to lose 10 dB in a long run of small coax and junk connectors.
> 
> 73, Jim K9YC
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