I'm new to this site so please forgive me if this has been covered.
I have a 1210 transverter that I built about a year ago and finally got =
around to getting it on the air recently. I seemed to be
working fine for local ragchewing but I did get a report that it was =
drifting in frequency by a 100 Hz or so. My intentions were
to use the 1210 to work meteor scatter using the new digitial modes and =
so I became concerned about this report of frequency=20
drift. The IF rig is a Yaesu FT-1000.=20
I connected a dummy load and began to run some tests. I first checked =
the FT-1000 and found it to be very stable.
But the counter showed that, sure enough, the carrier freq from the 1210 =
did drift rather badly=20
over a short term test. I ran the WJST program to simulate a contact and =
in about 10 minutes the frequency had drifted about 180
Hz. I attributed this to the slight heating effects in the transverter. =
It returned to approximately the starting frequency in a couple of=20
hours after I stopped transmitting. At first I was counting the output =
frequency (144.250 Mhz). I then counted the LO freq (116.0 Mhz) just to =
make sure and noted the same results. I have since left the unit on for =
weeks and noted that the LO frequency can
vary over about a range of +60 and -40 Hz during the day without any =
transmissions.
I have readjusted the LO several times and still see the same results.
Has anyone experienced this beside me? Has anyone proposed a solution?
Thanks,
Mark K5XH
--- StripMime Report -- processed MIME parts ---
multipart/alternative
text/plain (text body -- kept)
text/html
---
|