[time-nuts] modification Lucent RFTG

[paul swed]

Joerg
Yes this looks like a nice simple mod.
Its difficult to tell from the pictures but in order to use the sma it
looks like you cut the trace over by the cap.
I ran into the same thing. The lead goes into the board and its end point
is unclear.
When I released a solution about 9 months ago I used a video op-amp. This
gave gain and drive. But with more complexity.
It is a bit of a challenge to slip the boards in and out.
Thanks
Paul
WB8TSL

On Sun, Dec 13, 2015 at 6:00 AM, Rex <rexa at sonic.net> wrote:

> Joerg,
>
> This looks like a very useful mod on a unit that many of us have. I'm not
> aware of any schematics available for these, so I guess you have
> reverse-engineered the "black"  part of the schematic that you provided. --
> Nice work!
>
> Having said that, may I offer some minor criticism (constructive and
> positive, I hope) of your document?
>
> The schematic you provided shows the key transistors as Q1 and Q2. In the
> text you refer to Q208 and Q209 (which I think are marked on the board).
> From the description, I think Q1 = Q208 and Q2 = Q209. It would be nice if
> the schematic had the Q-numbers changed, or at least, you mentioned the
> equivalence in your text.
>
> (Trivial) Aren't you using an existing SMA connector for your output? So,
> maybe it should be black in the schematic.
>
> Your picture of the board rework is pretty low resolution; even zooming
> into it just gives bigger blurry image. You have added some annotations but
> they are in red over the green board color. Combined with the low
> resolution they are very hard to read. I'm pretty sure they remain in
> German in the English version too.
>
> My suggestions:
>     - Edit the schematic to change the Q-numbers to match the board and
> text, or at least give the equivalence in the text.
>     - Use a higher resolution picture and make the annotations more
> readable with different color or background shading.
>     - The picture you provide is "after". It would be nice to also have
> "before". If you don't have a before picture, I or some other member could
> probably take one.
>     - Consider having picture annotations in English for the English
> version.
>
> I think what you have done is great. I just think the sharing document
> could be improved to make it easier for others to duplicate.
>
> If you like, I could possibly help make a more readable annotated picture
> if you can provide me a higher res picture of the board. Just an offer to
> help if you would consider my suggestions. I think you will see my email in
> my post.
>
> -Rex   KK6MK
>
>
>
> On 12/12/2015 4:39 PM, Jörg Logemann wrote:
>
>> Hi,
>> I worked out a modification of the Lucent GPSDO to get 10MHz out of it
>> which I offer to the community. The article is available in english and
>> german (attached).
>>
>> best 73
>> Joerg, DL2NI
>>
>>
>>
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