softrock40 : Message: Re: [softrock40] Re: MiniBoots Amp

Don't overlook the 5W Pre Amp from http://hfprojects.com which can take
SDR output levels up to what's needed to drive their 100W amp. I have
built the 5W pre-amp and am about to get started on the 100W. As others
have noted, only the 100W stage needs the LPF.

73,
Leigh/WA5ZNU

Marsh Parker wrote:
> Thanks to all for your input. Looks like the ARRL design or the HF
> Packer might be the way to go. Should work with the Softrock RXTX.
>
> 73,
> Marsh, NC7V
>
>
>
>

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I am trying to determine if the MiniBoots amp at http://www.amqrp.org/kits/miniboots/miniboot.htm is a linear amp. I notice that JA9MAT, qrper723, has one and...

Marsh Parker
nc7v

Jan 31, 2007
12:01 am

Marsh, Hi No change is needed for CW operation but may have to add the bias circuit for SSB transmission because it's a class-C amplifier for CW transmission. ...

qrper723

Jan 31, 2007
12:11 am

... What is the bias circuit schematic and how is it adjusted?? Did not see any reference in the orig. article. Marsh, NC7V...

Marsh Parker
nc7v

Jan 31, 2007
12:22 am

There is also an interesting PA for SSB using IRF510 in push-pull. 5-6W out under 12V, 20-25W under 24-30V. Input 100-150mW for 12V, 1W for 24V. When run under...

jabauzit

Jan 31, 2007
2:08 am

For the last several years, there has been a push-pull IRF510 amp design int he ARRL handbook as well. The boards are available from Far Circuits. Each 510...

Terry
wb4jfi

Jan 31, 2007
4:20 am

... Hi Terry, I know about that one but did not mention it for the following reason: it uses a binocular in the output which I do not have in my junk box and...

jabauzit

Jan 31, 2007
4:40 am

Thanks for the comments again Jean-Claude. Yes, I agree that the binoc core could be difficult. I ended up buying the core kits from Amidon here in the US, I...

Terry
wb4jfi

Jan 31, 2007
5:08 am

... I think the zener is there to limit the input drive level (i.e to prevent it exceeding 3.3.v). Apparently the IRF510 is susceptible to damage if...

N Munro
gm4kgk

Jan 31, 2007
9:23 am

... Hi Norman, Yes the Zener is here to protect the IRF510 and is soldered directly to the gate to also provide thermal protection. What I don't understand is...

jabauzit

Jan 31, 2007
5:11 pm

Guys the amp is class C as original designed, but Wayne, NB6M modified it to class AB or A (not sure which) for SSB and Digital mode operation. The details...

DOUG PHILLIPS
w7rdp

Jan 31, 2007
5:01 pm

... ARRL HANDBOOK 2001 Chapter 17 - Receivers, Transmitters, Transceivers and Projects ...

Len Warner
hejsek2005

Feb 1, 2007
2:09 am

I know of a guy who built a big 6 meter linear amplifier using IRF510s. I think it was 2 modules of 8 fets push pull parallel. I think it was running on 24...

FRANCIS CARCIA
wa1gfz

Feb 1, 2007
2:38 am

... 500W out, 40V PS. I have been looking into it but wondered how the IRF-510 can be used on 6m. http://home24.inet.tele.dk/oz1pif/50MHz_IRF510.htm Does...

jabauzit

Feb 1, 2007
2:54 am

I would think a push pull stage would not need a lot of bias. The closer to class A the lower your third order crud. 150 ma at 40 volts would be 6 watts of...

FRANCIS CARCIA
wa1gfz

Feb 1, 2007
3:07 am

Thanks to all for your input. Looks like the ARRL design or the HF Packer might be the way to go. Should work with the Softrock RXTX. 73, Marsh, NC7V...

Marsh Parker
nc7v

Feb 1, 2007
4:59 pm

Don't overlook the 5W Pre Amp from http://hfprojects.com which can take SDR output levels up to what's needed to drive their 100W amp. I have built the 5W...

Leigh L. Klotz, Jr.
leighklotz

Feb 2, 2007
5:57 am

http://hfprojects.com also takes the 5 watt preamp one step further and combines it with a LPF kit and calls it the SlimGem. This amp will take a � watt input...

Tom Hall
raccoonnyc

Feb 2, 2007
2:18 pm

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