I’ll have to pull filter ,good idea . Let you know tomorrow . Thanks
Sent from my iPad
> On Sep 29, 2018, at 6:21 PM, MadScientist <dukeshifi@comcast.net> wrote:
>
> OK, I am involved in three threads regarding Paragons, Omni 5’s and Omni 6’s
> so I have gotten some crosstalk…
>
> If you select a filter position on your radio that has no filter in it, do
> you still hear the clicking sound when tuning?
>
> Gary
>
>> On Sep 29, 2018, at 5:33 PM, Byron Cordes via TenTec <tentec@contesting.com>
>> wrote:
>>
>> The radio is a Omni VI. Radio does rx and tx . can here and talk to people
>> even on 20 meters where that vfo noise is . Higher noise floor on 40- 160
>> you don’t here the vfo noise but on 20 meters it is very loud higher than
>> the people talking when tuning . Stop turning vfo and radio sounds normal
>> with people talking .
>>
>> Sent from my iPad
>>
>>> On Sep 29, 2018, at 5:23 PM, MadScientist <dukeshifi@comcast.net> wrote:
>>>
>>> Sorry, I misread… I was focussed on a previous radio (a Paragon).
>>>
>>> Your problem is most certainly due to the fact that the 5.0 to 5.5 MHz PLL
>>> is going out of lock. This model does not produce any out-of-lock fault
>>> regardless of the lock condition of the PLL so it can be out-of-lock with
>>> no indication of that condition. The radio will still produce normal band
>>> hiss but you will not be able to tune in signals.
>>>
>>> Oddly, he radio will still transmit in this condition, but well out of the
>>> Ham bands! It will transmit on the frequency at which the VCO settles when
>>> out-of lock, about 14.6 MHz, regardless of dial setting or display readout
>>> reading. It will also be very unstable.
>>>
>>> From what you describe (now that I am on the right page model-wise) i would
>>> suggest replacing the dual gate MOSFET in the loop IF.
>>>
>>> I recently repaired an Omni 6 that had the same problem as your Omni 5 has.
>>> That FET was the culprit and what’s worse, it pulled the alignment due to
>>> leakage of the device. It was highly intermittent. The heat/cool method was
>>> the only way I could point to it, but monitoring the loop test point was
>>> the only way I could prove it to myself.
>>>
>>> The way to really determine if this is the fault is to put a voltmeter on
>>> the 10K resistor test point of the loop IF (That resistor stands up on the
>>> board whereas all of the others lie down, and the test point is the high
>>> end of that resistor (thankfully). Then, from a cold start of the radio,
>>> monitor that voltage as the warmup progresses. While the PLL will lock with
>>> as little as 80 mV at t his point, it will be unstable. You SHOULD get, as
>>> I said, >300 mV at all three band test frequencies.
>>>
>>> The actually band selection is not important because this PLL operates the
>>> same regardless of band. However, an exception exists in that the PLL will
>>> not tune to “500” position on 40 meters.
>>>
>>> Also, the PLL tunes in opposite directions on low bands and high bands.
>>> That is why I chose 20 meters to select which coil to peak at what
>>> frequency.
>>>
>>> I used a BF988, available from Littediode on eBay to replace the loop IF
>>> FET. The devices I get for Littlediode always work so they are a safe
>>> seller IMHO.
>>>
>>> You may need to align the loop IF if you do not get at least 300 mV DC on
>>> the loop IF test point on all portions of the band (14.000, 14.250 and
>>> 14.500) since this is a broadly tuned LC IF stage that was likely
>>> originally aligned using a sweep generator.
>>>
>>> I approximated the sweep generator by aligning the three IF coils, one a
>>> tach frequency test point. The left most I peaked at 14.200, the middle one
>>> at 14.250 and the right most one at 14.500 (radio on 20 meters, of course).
>>>
>>> Gary
>>>
>>>> On Sep 29, 2018, at 3:42 PM, Dry Martini Holding Company😎 <qrp@kg4kgl.net>
>>>> wrote:
>>>>
>>>> I have a similar issue with my V.9. When I first turn it on, it will be
>>>> fine then recv audio will drop out. If I leave it on for 15 or 20 min,
>>>> recv audio becomes normal again and is fine the rest of the day.
>>>> st point
>>>> I sent mine to steve Yudell in Florida and he had it for a couple of weeks
>>>> and it worked fine for him after he went through it. Now that I have it
>>>> back it has started doing it again. I just don’t feel like boxing it up
>>>> and sending it back. I am just going to live with it.
>>>>
>>>> If you find out what the problem is, let me know.
>>>>
>>>> Robert
>>>> KG4KGL
>>>>
>>>>> On Sep 29, 2018, at 15:40, arsn4dd@charter.net wrote:
>>>>>
>>>>> Is there an Omni V mechanic in the house? My radio is going to need
>>>>> one if it doesn't straighten up... HI HI
>>>>> I have a very sparingly-used Omni V.9 that has developed an
>>>>> intermittent receive issue. From a cold start, the radio powers up and
>>>>> operates properly. After some random period of time, I can power cycle
>>>>> the radio, and as a result, I lose receive signals. I retain plenty of
>>>>> audio, and plenty of what sounds like band noise, but there no signals
>>>>> anywhere. I can leave the radio off for a couple of minutes, power it
>>>>> up, and the signals return. Before the suggestion is floated, I have
>>>>> exercised every connection in the radio with DeOxit. I have tightened
>>>>> and re-tightened every screw on every board in the radio. I have not,
>>>>> however re-seated any of the chips. Is there enough information here
>>>>> to generate suggestions? I admit to being mostly an appliance
>>>>> operator, but I might be capable of doing a few diagnostics. Thanks in
>>>>> advance for any guidance.
>>>>> Best Regards to all!
>>>>> Dennis N4DD
>>>>> _______________________________________________
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>>>>> TenTec@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>>>
>>>>
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