Hi Joe,
Hmm, maybe the supply voltage drops a bit during the PTT is down (driver
current consumption)? Do you also use 2 voltage levels? For me it is 5V
and 12V where 5V is stable and 12V may drop a bit during key down. So if
you're generating your TX frequency by a xtal which is affected by a
dropping supply voltage, there may be a small change in frequency.
Just a theory...
73, Stefan
Am 25.11.2012 18:03, schrieb [email protected]:
Hi Stefan,
Thank-you for the schematic of the 160-630m XVTR. It seems we use
similar gating so it is unclear to me where the incoherence in phase
originates.
73
Joe
On Sun, 25 Nov 2012, Stefan Schäfer wrote:
Hi Joe,
For example my MF PA is also keying coherently, see the schematic at
https://dl.dropbox.com/u/19882028/MF/100W%20475kHz%20PA.png
Not difficult :-)
73, GL, Stefan
Am 25.11.2012 01:31, schrieb [email protected]:
Markus,
Thank-you for the very helpful information. It seems that achieving
coherence is not at all difficult and a worthwhile project for the
future.
73
Joe
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