[Lowfer] Will an LF UpConverter Really be worth the effort, and expense

[Douglas D. Williams]

I think Todd bought a large batch of them off eBay. You can see how large
it is in this pic:

https://dl.dropboxusercontent.com/u/33457409/toddconverter.jpg

I think some members of this list have had some success with DIY crystal
ovens. I can't remember exactly how they did it, but it involved creating a
sleeve with a heater for the little crystal.

D.

On Sun, Dec 7, 2014 at 9:49 AM, Ben Hall <kd5byb at gmail.com> wrote:

> On 12/6/2014 7:33 AM, Douglas D. Williams wrote:
>
>> The only LF converter that I have found to be adequate for QRSS work is
>> the
>> one that Todd Roberts custom builds. It uses the AMRAD design, as
>> published
>> in the April, 2002 edition of QST, but Todd has modified the circuit and
>> added a very large and stable ovenized 3.0 MHz oscillator. I use one in
>>
>
> I wonder where he obtained the oven-stabilized oscillator?
>
> I've been tempted to build the AMRAD converter even after having good
> results (with QRSS30 as the slowest mode I've tried) with my Jackson Harbor
> Press upconverter that uses a 4.0 MHz computer xtal.
>
> Mostly just 'cause I like to build things.  ;)  Probably I should be
> building a low-pass, 500 kHz filter first to cut down on the local AM BC
> junk around here.
>
> The e-place and the usual surplus outlets seem to have a ton of 10 MHz
> units, a good quantity of 5 MHz units, but I've not seen many else.
> Ideally, I'd like to find one that is 7 MHz so I'm using the 40M band in
> the KX3, but so far, no luck.
>
> thanks much and 73,
> ben, kd5byb
>
>
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