Topband: Spectrum

Fri May 29 13:11:36 EDT 2020

Rick,
Spectrum cable TV and Internet here (no phone) in central Ky. No problems after running QRO (~ 1.25 KW) for about 6 months 160 thru 10.

73,
Bill WE5P

Comfortably Numb

> On May 29, 2020, at 13:02, rick darwicki via Topband <topband at contesting.com> wrote:
> 
> Hi all,
> I had Uverse TV and 1 KW blew away their modem, anyone operating QRO using Spectrum for TV, Phone and Internet ?
> I assume would have a box with DVR and WIFI.  Any problem with any feature being blown away or hash in recorded programs?
> If it works better than my ATT and DirecTV I might go for my second 100 on Topband hi hi
> Thanks
> 
> Rick N6PE
> 
> ======================================================================
> 
> 
> Dying is easy, the hard part is living
> 
> 
> 
> 
> 
> 
> 
> 
>    On Friday, May 29, 2020, 09:00:47 AM PDT, <topband-request at contesting.com> wrote:  
> 
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> Today's Topics:
> 
>   1. 160M shunt fed choke (tony.kaz at verizon.net)
>   2. Re: 160M shunt fed choke (Jim Brown)
>   3. Re: 160M shunt fed choke (tony.kaz at verizon.net)
>   4. Re: 160M shunt fed choke (Jim Brown)
>   5. Re: 160M shunt fed choke (Raymond Benny)
>   6. Re: 160M shunt fed choke (tony.kaz at verizon.net)
>   7. Re: 160M shunt fed choke (fmoeves)
>   8. Re: 160M shunt fed choke (Jim Brown)
>   9. Re: 160M shunt fed choke (Jim Brown)
>   10. Re: 160M shunt fed choke (Wes N7WS)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 28 May 2020 11:57:56 -0400
> From: <tony.kaz at verizon.net>
> To: <topband at contesting.com>
> Subject: Topband: 160M shunt fed choke
> Message-ID: <0a7201d63508$c1827090$448751b0$@verizon.net>
> Content-Type: text/plain;    charset="us-ascii"
> 
> I shunt feed my tower on 160M. The feed is about 4' above the base of the
> tower. I use a vacuum cap beta match. I use three vacuum caps. I have a
> vacuum relay to switch between high and low 160M. The coax from the shack is
> all underground to the base of the tower. The shield of the coax and the
> matching network is grounded to a tower leg.
> 
> Is there a potential benefit to adding a ferrite core choke for this type of
> setup?  I can easily add one inside the match box. I could follow K9YC's
> info for a 18 turn RG-400 on a 2.4" #31 core.  
> 
> Tnx for any feedback
> 
> N2TK, Tony
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Thu, 28 May 2020 10:36:53 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID:
>     <7ad4aa2c-8cc6-4512-2599-d663fe98b1a1 at audiosystemsgroup.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
>> On 5/28/2020 8:57 AM, tony.kaz--- via Topband wrote:
>> Is there a potential benefit to adding a ferrite core choke for this type of
>> setup?
> 
> What do you have for a radial system?  That's the primary determining 
> factor. The choke prevents the coax from being used as a radial. If you 
> have a robust radial system, that's far less of an issue.
> 
> 73, Jim K9YC
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Thu, 28 May 2020 14:06:21 -0400
> From: <tony.kaz at verizon.net>
> To: <jim at audiosystemsgroup.com>,    <topband at contesting.com>
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID: <0c0301d6351a$b1d90520$158b0f60$@verizon.net>
> Content-Type: text/plain;    charset="us-ascii"
> 
> Hi Jim,
> In ground radials - 60. Length 60-100' depending on direction due to a close
> in stone wall in one direction.
> All the coax is buried and all the shields are tied to the tower legs about
> a foot up the tower after the leave the ground.
> 
> N2TK, Tony 
> 
> -----Original Message-----
> From: Topband <topband-bounces+tony.kaz=verizon.net at contesting.com> On
> Behalf Of Jim Brown
> Sent: Thursday, May 28, 2020 1:37 PM
> To: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> 
>> On 5/28/2020 8:57 AM, tony.kaz--- via Topband wrote:
>> Is there a potential benefit to adding a ferrite core choke for this 
>> type of setup?
> 
> What do you have for a radial system?  That's the primary determining
> factor. The choke prevents the coax from being used as a radial. If you have
> a robust radial system, that's far less of an issue.
> 
> 73, Jim K9YC
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
> 
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Thu, 28 May 2020 11:41:45 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID:
>     <843d3836-6a7d-4f5e-cef2-369d6256ab7f at audiosystemsgroup.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> I'd guess that you're probably fine without the choke.
> 
> 73, Jim K9YC
> 
>> On 5/28/2020 11:06 AM, tony.kaz at verizon.net wrote:
>> Hi Jim,
>> In ground radials - 60. Length 60-100' depending on direction due to a close
>> in stone wall in one direction.
>> All the coax is buried and all the shields are tied to the tower legs about
>> a foot up the tower after the leave the ground.
>> 
>> N2TK, Tony
>> 
>> -----Original Message-----
>> From: Topband <topband-bounces+tony.kaz=verizon.net at contesting.com> On
>> Behalf Of Jim Brown
>> Sent: Thursday, May 28, 2020 1:37 PM
>> To: topband at contesting.com
>> Subject: Re: Topband: 160M shunt fed choke
>> 
>>> On 5/28/2020 8:57 AM, tony.kaz--- via Topband wrote:
>>> Is there a potential benefit to adding a ferrite core choke for this
>>> type of setup?
>> 
>> What do you have for a radial system?  That's the primary determining
>> factor. The choke prevents the coax from being used as a radial. If you have
>> a robust radial system, that's far less of an issue.
>> 
>> 73, Jim K9YC
>> _________________
>> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
>> 
> 
> 
> 
> ------------------------------
> 
> Message: 5
> Date: Thu, 28 May 2020 12:20:53 -0700
> From: Raymond Benny <rayn6vr at gmail.com>
> Cc: 160 <topband at contesting.com>
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID:
>     <CAHv=PBGV2hgeCt6sg2X6XoqDpq1w7LcmL20WPG73MEeq626L-A at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
> 
> One way to tell if a choke is needed I would think, is to add say, a random
> lenght of coax, 20 - 40 ft, to the shack end of you coax and see if your
> SWR changes. If so, then a then a choke could help.
> 
> Jim, does this sound like a reasonable test? I'm no expert on vertical
> antennas, just my experience.
> 
> Ray,
> N6VR/W7YA
> 
> 
> 
>> On Thu, May 28, 2020, 11:42 AM Jim Brown <jim at audiosystemsgroup.com> wrote:
>> 
>> I'd guess that you're probably fine without the choke.
>> 
>> 73, Jim K9YC
>> 
>>> On 5/28/2020 11:06 AM, tony.kaz at verizon.net wrote:
>>> Hi Jim,
>>> In ground radials - 60. Length 60-100' depending on direction due to a
>> close
>>> in stone wall in one direction.
>>> All the coax is buried and all the shields are tied to the tower legs
>> about
>>> a foot up the tower after the leave the ground.
>>> 
>>> N2TK, Tony
>>> 
>>> -----Original Message-----
>>> From: Topband <topband-bounces+tony.kaz=verizon.net at contesting.com> On
>>> Behalf Of Jim Brown
>>> Sent: Thursday, May 28, 2020 1:37 PM
>>> To: topband at contesting.com
>>> Subject: Re: Topband: 160M shunt fed choke
>>> 
>>> On 5/28/2020 8:57 AM, tony.kaz--- via Topband wrote:
>>>> Is there a potential benefit to adding a ferrite core choke for this
>>>> type of setup?
>>> 
>>> What do you have for a radial system?  That's the primary determining
>>> factor. The choke prevents the coax from being used as a radial. If you
>> have
>>> a robust radial system, that's far less of an issue.
>>> 
>>> 73, Jim K9YC
>>> _________________
>>> Searchable Archives: http://www.contesting.com/_topband - Topband
>> Reflector
>>> 
>> 
>> _________________
>> Searchable Archives: http://www.contesting.com/_topband - Topband
>> Reflector
>> 
> 
> 
> ------------------------------
> 
> Message: 6
> Date: Thu, 28 May 2020 16:04:14 -0400
> From: <tony.kaz at verizon.net>
> To: <jim at audiosystemsgroup.com>,    <topband at contesting.com>
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID: <0cf001d6352b$29e4ba90$7dae2fb0$@verizon.net>
> Content-Type: text/plain;    charset="us-ascii"
> 
> Tnx Jim
> Tony
> 
> -----Original Message-----
> From: Topband <topband-bounces+tony.kaz=verizon.net at contesting.com> On
> Behalf Of Jim Brown
> Sent: Thursday, May 28, 2020 2:42 PM
> To: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> 
> I'd guess that you're probably fine without the choke.
> 
> 73, Jim K9YC
> 
>> On 5/28/2020 11:06 AM, tony.kaz at verizon.net wrote:
>> Hi Jim,
>> In ground radials - 60. Length 60-100' depending on direction due to a
> close
>> in stone wall in one direction.
>> All the coax is buried and all the shields are tied to the tower legs
> about
>> a foot up the tower after the leave the ground.
>> 
>> N2TK, Tony
>> 
>> -----Original Message-----
>> From: Topband <topband-bounces+tony.kaz=verizon.net at contesting.com> On
>> Behalf Of Jim Brown
>> Sent: Thursday, May 28, 2020 1:37 PM
>> To: topband at contesting.com
>> Subject: Re: Topband: 160M shunt fed choke
>> 
>>> On 5/28/2020 8:57 AM, tony.kaz--- via Topband wrote:
>>> Is there a potential benefit to adding a ferrite core choke for this
>>> type of setup?
>> 
>> What do you have for a radial system?  That's the primary determining
>> factor. The choke prevents the coax from being used as a radial. If you
> have
>> a robust radial system, that's far less of an issue.
>> 
>> 73, Jim K9YC
>> _________________
>> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
>> 
> 
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
> 
> 
> 
> ------------------------------
> 
> Message: 7
> Date: Thu, 28 May 2020 16:06:43 -0400
> From: fmoeves <fmoeves at twc.com>
> To: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID: <mailman.26.1590768002.4590.topband at contesting.com>
> Content-Type: text/plain; charset=utf-8
> 
> I'm going from memory so...?I've seen a video of a simple detector.?In the video the guy ran along the feedline while transmitting low power.?You could see if there was a signal on the outside of the cable.?I'll look later to see if I find.?Fred KB4QZH?
> -------- Original message --------From: Raymond Benny <rayn6vr at gmail.com> Date: 5/28/20  3:21 PM  (GMT-05:00) To:  Cc: 160 <topband at contesting.com> Subject: Re: Topband: 160M shunt fed choke One way to tell if a choke is needed I would think, is to add say, a randomlenght of coax, 20 - 40 ft, to the shack end of you coax and see if yourSWR changes. If so, then a then a choke could help.Jim, does this sound like a reasonable test? I'm no expert on verticalantennas, just my experience.Ray,N6VR/W7YAOn Thu, May 28, 2020, 11:42 AM Jim Brown <jim at audiosystemsgroup.com> wrote:> I'd guess that you're probably fine without the choke.>> 73, Jim K9YC>> On 5/28/2020 11:06 AM, tony.kaz at verizon.net wrote:> > Hi Jim,> > In ground radials - 60. Length 60-100' depending on direction due to a> close> > in stone wall in one direction.> > All the coax is buried and all the shields are tied to the tower legs> about> > a foot up the tower after the leave the ground.> >> > N2TK, Tony> >> > -----Original Me
> ssage-----> > From: Topband <topband-bounces+tony.kaz=verizon.net at contesting.com> On> > Behalf Of Jim Brown> > Sent: Thursday, May 28, 2020 1:37 PM> > To: topband at contesting.com> > Subject: Re: Topband: 160M shunt fed choke> >> > On 5/28/2020 8:57 AM, tony.kaz--- via Topband wrote:> >> Is there a potential benefit to adding a ferrite core choke for this> >> type of setup?> >> > What do you have for a radial system?? That's the primary determining> > factor. The choke prevents the coax from being used as a radial. If you> have> > a robust radial system, that's far less of an issue.> >> > 73, Jim K9YC> > _________________> > Searchable Archives: http://www.contesting.com/_topband - Topband> Reflector> >>> _________________> Searchable Archives: http://www.contesting.com/_topband - Topband> Reflector>_________________Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
> 
> ------------------------------
> 
> Message: 8
> Date: Thu, 28 May 2020 13:15:26 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID:
>     <2e621209-c77a-43a8-3921-c19cf902845d at audiosystemsgroup.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
>> On 5/28/2020 12:20 PM, Raymond Benny wrote:
>> One way to tell if a choke is needed I would think, is to add say, a random
>> lenght of coax, 20 - 40 ft, to the shack end of you coax and see if your
>> SWR changes. If so, then a then a choke could help.
>> 
>> Jim, does this sound like a reasonable test?
> 
> No, I don't think so. The reasons for the choke are 1) to minimize noise 
> pickup on the coax from coupling to the antenna, and from there to your 
> RX; and 2) to keep TX RF off the coax shield. With the robust radial 
> system Tony describes, it seems unlikely that the coax shield would see 
> more than 1/60 of the TX current, or that the coax shield would 
> significantly change the feedpoint Z, or that it would contribute 
> audibly to RX noise.
> 
> If, however, the antenna was not ideally matched to the feedline, 
> changing the feedline length could change the Z at the transmitter. But 
> this would be a transmission line effect, not a common mode issue.
> 
> 73, Jim K9YC
> 
> 
> ------------------------------
> 
> Message: 9
> Date: Thu, 28 May 2020 13:19:16 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID:
>     <dea75abf-a37b-7da3-bd0d-4c58d9b3823e at audiosystemsgroup.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
>> On 5/28/2020 1:06 PM, fmoeves wrote:
>> I'm going from memory so...?I've seen a video of a simple detector.?In the video the guy ran along the feedline while transmitting low power.?You could see if there was a signal on the outside of the cable.?I'll look later to see if I find.
> 
> Tony's feedline is buried, so could be tricky. But it IS right to move 
> the probe along the feedline to find a current max, because the current 
> varies along the line because it would be acting as part of the antenna.
> 
> 73, Jim K9YC
> 
> 
> 
> ------------------------------
> 
> Message: 10
> Date: Thu, 28 May 2020 13:39:11 -0700
> From: Wes N7WS <wes_n7ws at triconet.org>
> To: jim at audiosystemsgroup.com
> Cc: topband at contesting.com
> Subject: Re: Topband: 160M shunt fed choke
> Message-ID: <7C6A9C89-E6B8-4158-ADE2-8ABFA6BCFECA at triconet.org>
> Content-Type: text/plain; charset=utf-8
> 
> A buried antenna. Why worry about it?
> 
> Wes. N7WS
> 
> Sent from my iPhone
> 
>> On May 28, 2020, at 1:19 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
>> 
>> ?On 5/28/2020 1:06 PM, fmoeves wrote:
>>> I'm going from memory so... I've seen a video of a simple detector. In the video the guy ran along the feedline while transmitting low power. You could see if there was a signal on the outside of the cable. I'll look later to see if I find.
>> 
>> Tony's feedline is buried, so could be tricky. But it IS right to move the probe along the feedline to find a current max, because the current varies along the line because it would be acting as part of the antenna.
>> 
>> 73, Jim K9YC
>> 
>> _________________
>> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
> 
> 
> 
> ------------------------------
> 
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> ------------------------------
> 
> End of Topband Digest, Vol 209, Issue 22
> ****************************************
> 
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector