I was operating 40m SSB recently and had a disturbing dual-tone carrier come up
on my frequency. The two tones were about 800 Hz and 600 Hz, +/-, and a good
S9.
I pushed the notch button on my SDR transceiver and both tones instantly and
completely disappeared, enabling perfect copy of the SSB station. I was so
surprised, I thought the two-tone signal had coincidentally ceased. I turned
the notch off and both tones were back at S9. Notch on again: both tones
completely gone.
I find this to be a dramatic improvement over the old fashion manual notch
filter which could only remove one tone.
73
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Bernie Skoch
via TenTec
Sent: Friday, July 21, 2017 3:07 AM
To: Discussion of Ten-Tec Equipment
Cc: Bernie Skoch; Rick Cochran; n4py3@earthlink.net
Subject: Re: [TenTec] notch filter for Eagle?
It's a very nice feature if you are bring QRMd by a nearby carrier. With a
good working one you can notch the carrier out and not have to listen to it.
> On Jul 20, 2017, at 20:51, Rick Cochran via TenTec <tentec@contesting.com>
> wrote:
>
> Well, use almost all CW on my OMNI VII. I am not sure what the notch filter
> is. Never used it.
>
> I have a couple of Yaesu rigs and have no idea how to use notch.
>
> Doesn't sound like a critical feature to me.
>
> 73s,
>
> WO8L
>
>
>
> Sent from my iPhone
>
>> On Jul 20, 2017, at 8:22 PM, Carl Moreschi <n4py3@earthlink.net> wrote:
>>
>> I find the hardware noise blanker on my Orion works very well. It's on a
>> par with the Flex 6500 noise blanker system.
>>
>> Carl Moreschi N4PY
>> 58 Hogwood Rd
>> Louisburg, NC 27549
>> www.n4py.com
>>
>>> On 7/20/2017 8:18 PM, David W LeJeune, Sr wrote:
>>> Thanks, Rick. I'd heard that Rob had a hand in it's improvement. Had a
>>> friend who had one of the original Orion's and the noise blanker was almost
>>> worthless. On my Orion II, the auto notch still causes distortion of the
>>> audio signal when in use. Not sure if this is common. Still use the Orion
>>> II on 80meter SSB and a lot on CW on all bands. But the Flex 6500 is a lot
>>> better than my old Flex 5000 on CW.
>>>
>>> Dave WN5V
>>>
>>> -----Original Message-----
>>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
>>> rick@dj0ip.de
>>> Sent: Thursday, July 20, 2017 4:55 PM
>>> To: 'Discussion of Ten-Tec Equipment'
>>> Subject: Re: [TenTec] notch filter for Eagle?
>>>
>>> Dave,
>>>
>>> That is only because Rob Sherwood worked long and hard on Ten-Tec and FLEX
>>> to fix their problems. When they originally shipped, neither were any good
>>> at blanking electric fences.
>>> We all owe Rob a huge amount of gratitude for the many years of service he
>>> has given us.
>>>
>>> 73
>>> Rick, DJ0IP
>>>
>>> -----Original Message-----
>>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
>>> David W LeJeune, Sr
>>> Sent: Thursday, July 20, 2017 9:48 PM
>>> To: 'Discussion of Ten-Tec Equipment'
>>> Subject: Re: [TenTec] notch filter for Eagle?
>>>
>>> I have an electrical fence next door. Both the noise blanker in my Orion
>>> II and the one in my Flex 6500 easily take out that type of noise as well
>>> as ignition noise. The Orion has a manual notch filter (sort of). It's
>>> really a fixed freq notch at either 300 hz or 1050 hz. You can use that
>>> with CW and the RIT - move the interfering hetrodyne inside of the selected
>>> notch. Of course, you have to accept the change in the pitch of the CW
>>> signal.
>>>
>>> Dave WN5V
>>>
>>> -----Original Message-----
>>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
>>> rick@dj0ip.de
>>> Sent: Thursday, July 20, 2017 9:36 AM
>>> To: 'Discussion of Ten-Tec Equipment'
>>> Subject: Re: [TenTec] notch filter for Eagle?
>>>
>>> Gary,
>>>
>>> Your Pro 2 of course is ancient history now. Was a great radio in its day.
>>> Manual notch filters are fine on CW because "we" use our brain to notch the
>>> disturbance and not the desired frequency. The auto-notch can't tell the
>>> difference.
>>>
>>> Regardless of what it can and can't do, if it dies, you probably won't even
>>> get spare parts for it. And brand new radios are no longer coming with
>>> manual notch filters (except for the old stock sitting on shelves and being
>>> offered at dumping prices to get rid of it).
>>>
>>> If my memory serves me right, that was still one of the radios with a
>>> useful noise blanker for blanking out electrical fences. None of the new
>>> DSP noise blankers can do that as well as the old noise blankers.
>>>
>>> There certainly were advantages in the older radios but we will probably
>>> only see one more new radio come out in Japan with that old technology...at
>>> the end of this year.
>>>
>>> I don't know if Mike will bring out an Eagle or Omni VII again. The eagle
>>> has a good noise blanker, the OM7 has a DSP blanker, but it has been
>>> improved in firmware for use near electrical fences; still not as good as
>>> older technology though.
>>>
>>> Ones step forward, two steps back! (hi)
>>>
>>> 73
>>> Rick
>>>
>>>
>>> -----Original Message-----
>>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
>>> Dukes HiFi
>>> Sent: Thursday, July 20, 2017 4:03 PM
>>> To: Discussion of Ten-Tec Equipment
>>> Cc: Bernie Skoch
>>> Subject: Re: [TenTec] notch filter for Eagle?
>>>
>>> In side-by-side comparison, an Icon IC-756 Pro2 notch filter versus an
>>> Orion/Eagle type notch filter, using my Pro 2 manual notch filter (which
>>> also works in CW, and is inside the AGC loop), I can hear weak but desired
>>> signals far more easily with the otherwise inferior Pro 2 than I can with
>>> the otherwise superior Orion/Eagle. This is especially true when the
>>> offending carrier is keyed, since the Pro 2 receiver is not constantly
>>> adjusting gain to compensate for the keyed offending carrier.
>>>
>>> One can SORT of obtain similar results by turning off the AGC in the
>>> Orion/Eagle when using the notch filter as long as you don’t need any AGC
>>> action.
>>>
>>> Gary
>>>
>>>
>>>
>>>> On Jul 20, 2017, at 8:34 AM, Bernie Skoch via
>>>> TenTec<tentec@contesting.com> wrote:
>>>>
>>>> Rick,
>>>>
>>>> I do not believe I am "out in right field."
>>>>
>>>> Someone commented that all Ten Tec notch filters are useless. I disagreed.
>>>>
>>>> 73,
>>>> Bernie
>>>>
>>>>> On Jul 20, 2017, at 02:30, rick@dj0ip.de<Rick@DJ0IP.de> wrote:
>>>>>
>>>>> You guys are all out in right field.
>>>>>
>>>>> No radio's auto notch filter works in CW mode.
>>>>> They cannot distinguish between the useful tone and the disturbing tone.
>>>>>
>>>>> And yes, in that case, a manual notch filter is indeed better, but
>>>>> show me a radio built today that has one.
>>>>>
>>>>> I find the Eagle's notch filter effective on SSB.
>>>>>
>>>>> 73
>>>>> Rick, DJ0IP
>>>>>
>>>>> -----Original Message-----
>>>>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
>>>>> Bernie Skoch via TenTec
>>>>> Sent: Thursday, July 20, 2017 3:21 AM
>>>>> To: Discussion of Ten-Tec Equipment
>>>>> Cc: Bernie Skoch; w2iy@verizon.net
>>>>> Subject: Re: [TenTec] notch filter for Eagle?
>>>>>
>>>>> "It's sort of useless, like all Ten Tec notch filters..."
>>>>>
>>>>> I _LOVE_ my Orion II notch filter!
>>>>>
>>>>> The automatic feature is good, but the manual one is about the
>>>>> best I've ever used.
>>>>>
>>>>> 73,
>>>>> Bernie
>>>>>
>>>>>> On Jul 19, 2017, at 16:33, Gary F<dukeshifi@comcast.net> wrote:
>>>>>>
>>>>>> The Eagle does have a notch function. I don't recall how to
>>>>>> activate it
>>>>> but it is in the manual.
>>>>>>
>>>>>> It's sort of useless, like all Ten Tec notch filters, since it is
>>>>>> outside
>>>>> the AGC loop, so, while it does not have the carrier, it also
>>>>> attenuated your desired signal by about as much as it reduces the carrier.
>>>>>>
>>>>>> The reduction to 20 watts in Tune is self-defense. Orion's do it
>>>>>> too. This
>>>>> is to prevent the presence of full 100 watts into a mismatch. It
>>>>> is good policy.
>>>>>>
>>>>>> Orion's had an option in which you could press the Power button,
>>>>>> I
>>>>> believe, to get 100 watts in Tune after match had been reached.
>>>>>>
>>>>>> Red arid green the A//B VFO, there really is no A or B VFO in the
>>>>> traditional sense and Eagle only has one tuning knob. Therefore,
>>>>> the A/B indicator serves no function in transceive operation. In
>>>>> split operation, that indicator should flip when going fro RX to
>>>>> TX to tell you which displayed frequency is the TX frequency.
>>>>>>
>>>>>> Gary
>>>>>>
>>>>>> Sent from my iPad
>>>>>>
>>>>>>> On Jul 19, 2017, at 3:05 PM, Michael Tortorella<w2iy@verizon.net>
>>>>>>> wrote:
>>>>>>>
>>>>>>> Hi all, I am hearing an awful lot of steady carrier signals up
>>>>>>> here in
>>>>> the
>>>>>>> frozen north of Downeast Maine. Most are not very strong and they go
>>>>> away
>>>>>>> when I disconnect the antenna so they are external to the radio.
>>>>>>> Today I am chasing TR8CA on 20 CW, he is way down in the noise,
>>>>>>> and
>>>>>>> 100 Hz away from one of these carriers. Sure would be nice to
>>>>>>> have something like a notch filter to help in situations like
>>>>>>> these but I could not see anywhere in the manual or front panel
>>>>>>> where I could notch the offending carrier. Is there any list wisdom on
>>>>>>> this?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On another note, I did contact service at TT last week with my
>>>>>>> question about power out in autotune; after only a few days
>>>>>>> delay I got an answer that the power out in autotune is 20 watts
>>>>>>> even though the power output shown on the display is 100. This
>>>>>>> seems not quite right from a human factors point of view, maybe
>>>>>>> there can be a firmware fix? Also, when exchanging VFOs, the
>>>>>>> A,B labels do not change even when the B vfo is in large type at
>>>>>>> the top of the display. I find this confusing. OK, I guess
>>>>>>> this turned into a longer letter about a couple of other things
>>>>>>> besides notch filtering, so please excuse my prolixity and thank
>>>>>>> for the BW. Any suggestions
>>>>> appreciated.
>>>>>>>
>>>>>>> Thanks and 73, Mike W2IY
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ---
>>>>>>> This email has been checked for viruses by AVG.
>>>>>>> http://www.avg.com
>>>>>>> _______________________________________________
>>>>>>> TenTec mailing list
>>>>>>> TenTec@contesting.com
>>>>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>>>>
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