TenTec
[Top] [All Lists]

Re: [TenTec] Wide roofing filter for the RX-366?

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Wide roofing filter for the RX-366?
From: Brian Carling <bcarling@cfl.rr.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 2 May 2014 16:57:21 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Kim, there are not many radios that will do that. For the price that a used 
Orion goes for I wouldn't mind having one.

I gather the Orion two is somewhat superior...

Best regards - Bry Carling



> On May 1, 2014, at 10:12 PM, Kim Elmore <cw_de_n5op@sbcglobal.net> wrote:
> 
> Yes, it's easy to conflate roofing filters with the more familiar IF filters. 
> They don;t serve the same purpose but can be complimentary. Sherwood's 
> presentation is excellent.
> 
> In my case, there's a guy about 2 mi away that runs 1.5 kW with a good beam 
> at 70 ft. He's strong enough to cause problems when he's on the same band and 
> pointed at me. There are several AM BC stations around and couple are 50 kW 
> oxyacetylene blowtorches, one at 1000 kHz. Because of them,  roofing filters 
> really do help on 160 m.
> 
> When I took my Orion II to FD, all the CW ops fell in love with it because 
> all the other local FD QRM vanished; it was as if they were all alone. Even 
> the phone ops were amazed they they could tune to within a few kHz of one of 
> the phone stations and have zero trouble with IMD.
> 
> Kim N5OP
> 
> 
>> On 5/1/2014 8:38 PM, Bob McGraw - K4TAX wrote:
>> While roofing filters are indeed nice and serve a really nice function, I 
>> truly believe  the lack of understanding as to what they do and how the 
>> perform and when they are needed is in short supply.    I  found that the 
>> "authority" Rob Sherwood has a very nice presentation on his website where 
>> he discusses the advantage and importance of roofing filters.
>> 
>> My general take is:  If one intends to operate with 5 to 10 active stations 
>> in an area the size of a football field on an event such as Field Day,  then 
>> they are absolutely necessary.  Otherwise, if you live in an area 5 to 10 
>> miles from town and the nearest ham does not operate on the same band the 
>> same time as you, then they aren't necessary but, certainly nice to have 
>> available.
>> 
>> Just remember, the selectivity is developed by the DSP system.
>> 
>> 73
>> Bob, K4TAX
>> 
>> 
>> 
>> 
>> ----- Original Message ----- From: "Kim Elmore" <cw_de_n5op@sbcglobal.net>
>> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>> Sent: Thursday, May 01, 2014 8:16 PM
>> Subject: Re: [TenTec] Wide roofing filter for the RX-366?
>> 
>> 
>>> While filters are expensive, they can be swapped out without a lot of 
>>> trouble. That said, I chose a wide filter of 6 kHz, then the 2.4 kHz 
>>> standard filter and finally a 500 Hz filter for the narrowest. In my 
>>> environment, I won't have to deal with any strong (next door) signals in a 
>>> 500 Hz passband. Whenever I take the rig to, say, FD, only the main rx is 
>>> much used and it has the 300 Hz roofing filter, 600 Hz, 1.0 kHz, 1.8 kHz, 
>>> 2.4 kHz, 6 kHz and 20 kHz filters.
>>> 
>>> I can't see the point in having a 2.7 kHz, 2.4 kHz, and 500/600 Hz filters 
>>> because there's not enough difference in the 2.7 kHz and 2.4. Perhaps a the 
>>> standard 2.4 kHz, 1 kHz and 500/600 Hz filter would be best if you have no 
>>> interest in AM.
>>> 
>>> Kim N5OP
>>> 
>>> 
>>>> On 4/30/2014 9:15 PM, Carl Gansen wrote:
>>>> I am curious about what members of the list are using for their wide
>>>> roofing filter
>>>> in the RX-366. At this time, with CW as my main interest, I have a 600Hz
>>>> and a
>>>> 300Hz in place in mine.
>>>> 
>>>> I have little to no interest in AM but I do listen in on digital modes with
>>>> FlDigi.
>>>> 
>>>> Can anybody offer some thoughts on the filter (brand & bandwidth) that they
>>>> chose
>>>> and the reasoning behind that choice?
>>> 
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>> 
>> 
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
> 
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec

<Prev in Thread] Current Thread [Next in Thread>