[600MRG] Fwd: The need to transceive

[Roger Graves]

Begin forwarded message:

> From: Roger Graves <ve7vv at shaw.ca>
> Subject: Re: [600MRG] The need to transceive
> Date: November 2, 2017 at 11:40:43 AM PDT
> To: John Harper <johnae5x at gmail.com>
> 
> John,
> 
> If you need 80m drive, then do you not have 100W output available, which can be reduced to 1/2W?
> I know of Flex6700 owner who is planning on using the MFSolutions transverter with his Flex, without any other amp stage.
> You just operate “crossband”, listening on 630, transmitting on 80.
> Or have I misunderstood something here?
> 
> Roger
> 
> On Nov 2, 2017, at 11:15 AM, John Harper <johnae5x at gmail.com> wrote:
> 
>> 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
>>> _______________________________________________
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>> 
>> 
>> 
>> 
>> -- 
>> 
>> John AE5X
>> https://ae5x.blogspot.com
>> 
>