What is this?


-----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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