04-11-2020, 10:40 PM
Hi Amie.
When I did the single 1J42A pantry tx I initially used an LC tunable circuit. The stability was really uncanny with only a few Hz drift after a few hours, even voltage drop from 9 to 6v made only a few tens of Hz difference, filament voltage made no difference to drift. Using a separate osc is the best way I think as I can tie the two split control grids, also able to get a good level of injected signal.
On a slightly different note I remember your dad asking me if he could repost my circuit of the panry tx on the Radioboard forum, seems like yesterday.
When I did the single 1J42A pantry tx I initially used an LC tunable circuit. The stability was really uncanny with only a few Hz drift after a few hours, even voltage drop from 9 to 6v made only a few tens of Hz difference, filament voltage made no difference to drift. Using a separate osc is the best way I think as I can tie the two split control grids, also able to get a good level of injected signal.
On a slightly different note I remember your dad asking me if he could repost my circuit of the panry tx on the Radioboard forum, seems like yesterday.
