Hello Bob,
Many thanks for your answer! - I did the BFO alignment already and all
BFO frequencies are okay, even CW TX is set to 9.00300 MHz.
Because there is no BFO in mode *FM*, the carrier is produced by a
separate XTAL on the FM board. This XTAL drives a Colpitts oscillator
and is tuned by a trimmer coil L2. I cannot get this single frequency
aligned. The maximum frequency with the core fully turned out of the
coil is 8.9965 MHz and so my FM TX carrier is always almost 1.5 kHz off
the RX.
Though I do not use FM very often, it would be nice if the radio does
work completely!
vy 73!
Sven, DJ2AT
Am 06.11.2018 16:34, schrieb Bob McGraw K4TAX:
Perform the BFO alignment in the sequence defined in the manual. All
steps must be done regardless of the mode you operate or do not
operate. Be sure the radio is up to operating temp. Perform the
sequence 2 or 3 times as there is interaction between the adjustments.
The set the Master Osc so the radio displays the correct frequency.
The display is not a true frequency measurement but is a display based
on the Master Osc. It does not know if the band Oscillator is off
frequency. Also you can trim each band to get the frequency per band a
bit closer.
Bob, K4TAX
Sent from my iPhone
On Nov 6, 2018, at 9:04 AM, Sven Ladegast via TenTec
<tentec@contesting.com> wrote:
Hello folks,
I do have trouble aligning the TX carrier frequency on an Omni 6+.
With no modulation applied, the TX carrier frequency shall be 9.00300
MHz measured at connector 73 of the board. I used a TMP-BNC cable and
connected it to connector 73 and connected the BNC connector to my
accurate frequency counter using a T-connector and additional 50 Ohms
termination.
The TX carrier frequency is aligned by turning the core of L2 but with
the core complete turned out of the coil I get a maximum frequency of
8.9965 MHz and cannot get to 9.00300 MHz. Do have anyone an idea what
is going wrong? Aged XTAL?
73!
Sven, DJ2AT
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