I should add that all of the LS04 outputs are summed through 270 Ohm
resistors, giving something close to 50 Ohms output. At any rate, I think I
get something like 0 dBm into 50 Ohms, with the switchable attenuator
dropping it down to -20 dBm. Good level for rx antenna experiments.
73,
geo - n4ua
On Tue, Nov 25, 2014 at 7:45 AM, George Dubovsky <n4ua.va@gmail.com> wrote:
> Nothing original here, but I use a cheap 1.8432 packaged logic-level
> oscillator driving all the gates of a 74LS04 in parallel, followed by a
> switchable 20 dB pad, all packaged up in a small minibox. I run it off a
> 12V gel-cell.
>
> 73,
>
> geo - n4ua
>
> On Tue, Nov 25, 2014 at 7:29 AM, Clive GM3POI <gm3poi2@btinternet.com>
> wrote:
>
>> Hi, Can anyone recommend a stable low power signal source suitable for
>> tweaking RX antennas. I only need 160m and will only be used within say 10
>> wavelengths. Preferably something off the shelf. Thanks Clive GM3POI
>>
>> _________________
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>>
>
>
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