[TenTec] notch filter for Eagle?

Thu Jul 20 10:36:04 EDT 2017

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 at 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 at 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 at dj0ip.de <Rick at 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 at 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 at 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 at 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 at 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
>>>> 
>>>> 
>>>> 
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