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-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Butch Bussen
Sent: Saturday, April 13, 2013 6:02 PM
To: [log in to unmask]
Subject: Re: Amplifier for H.F
I have a m f j 998 I'm probably going to sell. I sent it back to m f j and
it is still in the box after bgetting it back. I'm not sure what a fair
price would be. Any interest? I'll do some looking around.
73
Butch
WA0VJR
Node 3148
Wallace, ks.
On Sat,
13 Apr 2013, Kelvin Marsh wrote:
> Hi Don,
>
> Thought I'd bring this back to the list, as others might benefit and
> contribute <smile>. I think your idea of having between 500W and 1KW
> is good.
>
> There are several solid state amps with auto tuners built in, but I'm
> not sure what aural feedback they would give you. Personally, I use
> the MFJ 998 auto ATU, and I'm very impressed with it. It can handle
> 1.5KW, and has aural tones to let you know the approximate match, and
> beeps will guide you through using the memory banks. The menu is not
> accessible, but since the initial setup, I've never needed to use it.
> One nice feature is that while tuning it opens the PTT line. If your
> antenna goes bad during transmission, the AATU will start hunting and
> the amp will be disconnected! The only problem is the cost...
>
> I use all Icom gear, and the PW1 amp automatically changes band, using
> CIV data from the radio. I understand that several amps can do this,
> like the Yaesu Quadra, and the Expert 1, but the latter may need a PC
> to manage the band changes.
>
> From what I've seen, the Ameritron amps, like the ASL-600, look to be
> very good value, and I guess the lack of an internal tuner is an
> advantage, on the basis that there's no point paying for something you
> might not use <smile>.
>
> ***
> Hi Don,
>
> Your amplifier query is interesting, and a question a lot of blind
> ops are asking at the moment! I guess you could help by saying what
> power output you want, your budget, if you will already have a power
> supply, which bands it should cover, and the type of antenna you have.
> It would also be useful to know if you have an accessible power meter,
> a QRO ATU and whether you want auto band changing.
>
> As Bob has said, although there is no need to manually juggle the
> tuning controls with a solid state amp, it needs either a resonant
> antenna or a capable ATU.
>
> Although the protection circuits should prevent any amp damage, a
> mismatch is likely to either trip the amp or cause it to sharply fold back
the power.
>
> I use a fully automatic 1KW solid state amp with internal auto ATU
> here, but I did not get enough aural feedback for my satisfaction
> <smile>. I prefer to use an external auto ATU that I can use with
> confidence, and hear exactly what is going on. Especially useful at
> RF power that can cause serious injury or expensive damage!
>
> Best wishes, Kelvin Marsh - M0AID
>
> Working to improve accessibility for radio amateurs with disabilities
>
> www.active-elements.org
>
> For accessibility evaluations of amateur equipment and MP3 manuals
>
>
> -----Original Message-----
> From: For blind ham radio operators
> [mailto:[log in to unmask]]
> On Behalf Of Don Risavy, Jr.; NR4DR
> Sent: 12 April 2013 23:55
> To: [log in to unmask]
> Subject: Amplifier for H.F
>
> Wondered does anyone happen to have a good recommendation on a amp for
> h.f that's solid state and no tuning involved?
>
> Thanks.
>
> Cul 73 nr4dr
>
>
>
>
>
>
>
>
>
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