[600MRG] The need to transceive

[John Harper]

Hi Roger,

I'm using the amp from WA3ETD which requires an 80m input:
http://njdtechnologies.net/the-mf-solutions-630-meter-transmit-downconverter/

I'm currently looking at small QRP transmitters since I need an 80m signal
to drive the amp. A few kits are available and I suppose I could just use
the components of the final 2N222 or 3907 or whatever, omitting the
oscillator circuitry. I built many of the SoftRock kits a few years ago but
eventually sold them.

73 - John

On Thu, Nov 2, 2017 at 12:52 PM, Roger Graves <ve7vv at shaw.ca> wrote:

> John,
>
> Which amp do you have? I have a 25W one that as supplied requires 500 mW
> drive, if the 6dB attenuator were removed it would be 250 mW, if the 1:1
> input transformer were replaced with a stepup design (mosfets have high
> input Z on 630) I think it might get down to 25 mW. So you might not need
> an extra amp stage if your amp is similar.
>
> The SoftRock RXTX uses a 2N2222 for the driver stage, you could look at
> the schematic of that for ideas and see my mod for a MF/LF transformer
> design.
> http://qsl.net/v/ve7vv//Files/RXTX LF-MF Modification.pdf
> 73,
> Roger
>
> On Nov 2, 2017, at 9:45 AM, John Harper <johnae5x at gmail.com> wrote:
>
> The transverter output on my Flex is 10-20 mW - the required RF level into
> my 630m amplifier is 150-500 mW.
>
> Does anyone know of a schematic/kit of a low-level amplifier that would be
> suitable for raising the transverter's output to the required level?
>
> --
>
> John AE5X
> https://ae5x.blogspot.com
> _______________________________________________
> 600MRG mailing list
> 600MRG at w7ekb.com
> http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
>
>
>


-- 

John AE5X
https://ae5x.blogspot.com