I have the par 40-10. works pretty well.
had it run as a sloper to a 31 foot jackite pole near the front porch. that
was the station antenna for the kx3 running 10 watts, worked all over the
u.s. and europe.
----- Original Message -----
From: "Tom Fowle" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, January 19, 2016 9:45 PM
Subject: Re: changed subject, Myantennas.com
> Gary,
> Yeah, that's what Danny of myantennas said, one of those things that seem
> obvious once you get it.
>
> I'm seriously considering getting one of his EFHW4010 antennas and putting
> it partly in my attic and partly over the back yard.
>
> Tom Fowle WA6IVG
>
> On Tue, Jan 19, 2016 at 04:16:56PM -0500, Gary Lee wrote:
>> I have never used that particular brand, but have used and own the parr
>> =
>> end fed.
>>
>> It does work multi band. typically, it consists of a small broadband 60
>> =
>> to 1 or tso transformer.
>> This has a bnc or so239 connector for coax, and a threaded stud with nut
>> =
>> for the end fed wire.
>>
>> the properties of an end fed half wave are such that it will be resonant
>> =
>> on any band for which its length is a multiple of a half wave.
>>
>> Therefore, an antenna of roughly 135 feet is resonant on 80, 40, 20, 15 =
>> and ten meters.
>> This can be extended by building a fuches tuner.
>> This uses a tapped secondary coil and a variable cap instead of a fixed =
>> transformer. With this even resonance on 60 and 30 can be obtained.
>> I have a qrp version of this tuner, but haven=E2=80=99t experimented =
>> with it yet.
>>
>> Looks like a neat field antenna, only needs one support
>>
>> Gary Lee
>> [log in to unmask]
>>
>>
>>
>> > On Jan 18, 2016, at 9:12 PM, Tom Fowle <[log in to unmask]> wrote:
>> >=20
>> > Looking at the myantennas.com web site, he has a set of end fed =
>> multi-band
>> > half wave antennas which he claims exhibit low swr on several adjacent
>> > bands. He says nothing about matching networks but says " no tuner
>> > required"
>> >=20
>> > Does anybody have experience with any of his "EFHW" antennas, and if =
>> so how
>> > does he do it?
>> > You just have to have some kind of a matching network for an end fed =
>> half
>> > wave.
>> >=20
>> > tom Fowle WA6IVG
>> >=20
>> > On Sat, Jan 16, 2016 at 11:00:08PM -0600, Dr. Ronald E. Milliman =
>> wrote:
>> >> The Common Mode Choke I use is the CMC-130-3K produced by and =
>> available from
>> >> MyAntennas.com. Here is the direct URL:
>> >>=20
>> >> http://myantennas.com/wp/product/cmc-130-3k/
>> >>=20
>> >> These Common Mode Chokes are produced by Danny Horvat who is an =
>> interesting
>> >> fellow. He produces a variety of antennas and antenna related =
>> products.
>> >>=20
>> >> Ron, K8HSY
>> >>=20
>> >> -----Original Message-----
>> >> From: For blind ham radio operators =
>> [mailto:[log in to unmask]]
>> >> On Behalf Of Tom Behler
>> >> Sent: Saturday, January 16, 2016 10:05 AM
>> >> To: [log in to unmask]
>> >> Subject: Re: How to Stop RFI from Shutting Down My TS-2000's Power =
>> Supply?
>> >>=20
>> >> Richard.
>> >>=20
>> >> I'd be interested in what kind of common mode RF chokes you get, or =
>> what
>> >> others on the list use. and where they can be gotten.
>> >>=20
>> >> I, too, have some RF issues here on certain bands, although they are =
>> not as
>> >> serious as what you are dealing with.
>> >>=20
>> >> Tom Behler: KB8TYJ
>> >>=20
>> >>=20
>> >> -----Original Message-----
>> >> From: For blind ham radio operators =
>> [mailto:[log in to unmask]]
>> >> On Behalf Of Richard B. McDonald
>> >> Sent: Saturday, January 16, 2016 10:52 AM
>> >> To: [log in to unmask]
>> >> Subject: Re: How to Stop RFI from Shutting Down My TS-2000's Power =
>> Supply?
>> >>=20
>> >> Hi Tom!
>> >>=20
>> >> No, I do not have a common mode choke, but I think I am going to get =
>> one!
>> >>=20
>> >> 73,
>> >> Richard KK6MRH
>> >>=20
>> >> -----Original Message-----
>> >> From: For blind ham radio operators =
>> [mailto:[log in to unmask]]
>> >> On Behalf Of Tom Fowle
>> >> Sent: Friday, January 15, 2016 5:59 PM
>> >> To: [log in to unmask]
>> >> Subject: Re: How to Stop RFI from Shutting Down My TS-2000's Power =
>> Supply?
>> >>=20
>> >> richard,
>> >> I forget if you said whether you have a common mode choke in the coax
>> >> =
>> to
>> >> your antenna?
>> >> That's always a first try at keeping R.F. out of where it doesn't =
>> belong.
>> >>=20
>> >> Also you could try disconnecting the ground from the power supply, =
>> and/or
>> >> making that individual ground wire a bit longer and taking a few =
>> turns of it
>> >> through a ferite core near the supply.
>> >>=20
>> >> Yes it's closer to sorcery than science! <GRIN>
>> >>=20
>> >> good luck
>> >> Tom Fowle WA6IVG
>> >>=20
>> >> On Fri, Jan 15, 2016 at 11:11:43AM -0500, Steve Forst wrote:
>> >>> Dave,
>> >>>=20
>> >>> I'm not an electrician or a doctor (although I played one when I
>> >>> was=20=
>>
>> >>> 6), but my understanding is that the National Electric Code (NEC) =
>> mandates
>> >>> that all grounds should be bonded to the electric mains ground.
>> >>>=20
>> >>> I'm sure others with more experience will chime in.
>> >>>=20
>> >>> 73, if you are on the 20 meter net Sunday, try the processor, it=20
>> >>> brought you up a bit on 40 last Sunday when you were chatting with
>> >> Junior.
>> >>> Steve KW3A
>> >>>=20
>> >>>=20
>> >>>=20
>> >>>=20
>> >>>=20
>> >>> On 1/15/2016 10:54 AM, David Weigel wrote:
>> >>>> Hi, Richard, Steve and readers:
>> >>>> It is always interesting to learn about the various ways to
>> >>>> reduce=20=
>>
>> >>>> or eliminate RF in the radio room. I was wondering if it would be =
>> a=20
>> >>>> better practice or at least worth a try to NOT connect the 2
>> >>>> ground=20=
>>
>> >>>> rods together electrically. I was thinking that the 120 VAC
>> >>>> ground=20=
>>
>> >>>> rod might create a low volume "buzz" or spiky noise, coming back
>> >>>> on=20=
>>
>> >>>> the separate equipment-ground rod pathway. But I could be wrong.
>> >>>> And, as Steve suggested earlier, my preference is to place
>> >>>> ferrite=20=
>>
>> >>>> clamps on all cables, jumpers, etc. "Line Isolators are =
>> recommended=20
>> >>>> by The Radio Works, particularly when there are extraordinary =
>> length=20
>> >>>> connections to ground rods, or when there can be no ground rodds=20
>> >>>> whatsoever. although I have never used them. Just stirring the =
>> pot,
>> >> slowly.
>> >>>>=20
>> >>>> Dave Weigel KD4JEZ
>> >>>>=20
>> >>>> -----Original Message-----
>> >>>> From: For blind ham radio operators=20
>> >>>> [mailto:[log in to unmask]]
>> >>>> On Behalf Of Steve Forst
>> >>>> Sent: Friday, January 15, 2016 10:16 AM
>> >>>> To: [log in to unmask]
>> >>>> Subject: Re: How to Stop RFI from Shutting Down My TS-2000's Power
>> >> Supply?
>> >>>>=20
>> >>>> Ok, I misunderstood. The way I had read the other post, I had =
>> thought
>> >>>> that you were running several wires from the shack to the outside =
>> rod,
>> >>>> one for each piece of gear. That wouldn't be a good idea. =
>> Sounds
>> >>>> like you have a good handle on the ground side of things.
>> >>>>=20
>> >>>> 73, Steve KW3A
>> >>>>=20
>> >>>> On 1/15/2016 9:55 AM, Richard B. McDonald wrote:
>> >>>>> Hi Steve!
>> >>>>>=20
>> >>>>> Yes, indeed, this whole RFI thing looks to be not just a bitch=20
>> >>>>> (pardon the
>> >>>>> French) but also a bit more art and trial and error rather than
>> >> science!
>> >>>>> Following is a bit more of an explanation of my present ground =
>> wire
>> >> setup.
>> >>>>>=20
>> >>>>> Inside the shack is a ground bus (I think that is what it is=20
>> >>>>> called, a.k.a., a "common point") that has about five terminals.
>> >>>>> Attached to each of these terminals is a length of 14 gauge=20
>> >>>>> insolated stranded copper wire that attaches to equipment either =
>> by=20
>> >>>>> its ground post (wing
>> >>>>> nut) or in the case of my PC and TS-2000's power supply by=20
>> >>>>> attaching the ground wire to a chassis screw (because they have
>> >>>>> no=20=
>>
>> >>>>> dedicated grounding post). The length of each of these ground=20
>> >>>>> wires varies from ~3' to ~7' depending on the distance of the=20
>> >>>>> respective equipment to the bus. =46rom the bus there is a
>> >>>>> single=20=
>>
>> >>>>> ~6" ~10 gauge insolated wire that goes through the wall into my=20
>> >>>>> garage and attaches to an 8' copper ground rod which is sunk
>> >>>>> into=20=
>>
>> >>>>> the ground with only ~6" of it sticking up. About 6" away from=20
>> >>>>> this ground rod is a second ground rod attached to which is AC
>> >> grounding for all AC power into the shack.
>> >>>>> Then, both of these ground rods are connected together by heavy=20
>> >>>>> copper
>> >>>> wire. This electrical work was done by a professional electrician.
>> >>>>>=20
>> >>>>> So, I do not think it is really possible to shorten the lengths
>> >>>>> of=20=
>>
>> >>>>> these separate ground wires, and then attach all of them to a=20
>> >>>>> single wire running to the bus. These wires are already about
>> >>>>> as=20=
>>
>> >>>>> short as they can be. I do understand and agree that, in most=20
>> >>>>> situations, the distance from the bus and the ends of separate=20
>> >>>>> ground wires is longer; in which case a single wire
>> >>>>> *should* bridge that distance.
>> >>>>>=20
>> >>>>> HTH & 73,
>> >>>>> Richard KK6MRH
>> >>>>>=20
>> >>>>> -----Original Message-----
>> >>>>> From: For blind ham radio operators=20
>> >>>>> [mailto:[log in to unmask]]
>> >>>>> On Behalf Of Steve Forst
>> >>>>> Sent: Thursday, January 14, 2016 6:41 PM
>> >>>>> To: [log in to unmask]
>> >>>>> Subject: Re: How to Stop RFI from Shutting Down My TS-2000's Power
>> >> Supply?
>> >>>>>=20
>> >>>>> Richard,
>> >>>>>=20
>> >>>>> Grounding questions are one of those things in the hobby that =
>> will
>> >>>>> get you a multitude of contradictory suggestions.
>> >>>>>=20
>> >>>>> If you try them all, you will probably find one that works for =
>> you.
>> >>>>>=20
>> >>>>> I think all would agree that running multiple ground wires from =
>> each
>> >>>>> piece of gear in the shack to a ground rod is a bad idea. Usual
>> >>>>> practice is to run short pieces of grounding wire from each
>> >>>>> piece=20=
>>
>> >>>>> of gear to a common grounding point in the shack, with wires =
>> being as
>> >>>>> short as possible. Then a single heavy conductor to the ground =
>> rod.
>> >>>>>=20
>> >>>>> Another problem is the length of the wire (or wires in your
>> >>>>> case)=20=
>>
>> >>>>> from the equipment to the ground rod. If the wrong length, it
>> >>>>> (they) will radiate like an antenna.
>> >>>>>=20
>> >>>>> What is the length from the shack to the ground rod?
>> >>>>>=20
>> >>>>>=20
>> >>>>> Good luck, 73, Steve KW3A
>> >>>>>=20
>> >>>>> On 1/14/2016 9:08 PM, Richard B. McDonald wrote:
>> >>>>>> Hey Steve!
>> >>>>>>=20
>> >>>>>> You said it! This high power stuff is gnarly! I will try =
>> ferrite=20
>> >>>>>> if it persists. The antenna is about 40' from the shack.
>> >>>>>>=20
>> >>>>>> following is information about my grounding system. About 10'=20
>> >>>>>> from the shack, I have two copper 8' ground rods sunk into the =
>> ground.
>> >>>>>> All 120V AC into the shack is grounded to one of them.
>> >>>>>> Connected=20=
>>
>> >>>>>> to the other ground rod is a terminal; attached to which are =
>> about=20
>> >>>>>> five separate 14 gauge copper wires each of which goes to=20
>> >>>>>> equipment in the shack (rig, tuner, PC, amp, etc.). then,
>> >>>>>> both=20=
>>
>> >>>>>> ground rods are connected with a 10 gauge wire. For the power=20
>> >>>>>> supply which is shutting down, I just attached yet another
>> >>>>>> ground=20=
>>
>> >>>>>> wire, and I also wrapped its AC power cord in tin foil. I
>> >>>>>> have=20=
>>
>> >>>>>> not yet tested to see if it still shuts down with these new
>> >>>>>> two=20=
>>
>> >>>>>> grounding/shielding
>> >>>>> improvements.
>> >>>>>>=20
>> >>>>>>=20
>> >>>>>> 73,
>> >>>>>> Richard KK6MRH
>> >>>>>>=20
>> >>>>>> -----Original Message-----
>> >>>>>> From: For blind ham radio operators=20
>> >>>>>> [mailto:[log in to unmask]]
>> >>>>>> On Behalf Of Steve Forst
>> >>>>>> Sent: Thursday, January 14, 2016 7:27 AM
>> >>>>>> To: [log in to unmask]
>> >>>>>> Subject: Re: How to Stop RFI from Shutting Down My TS-2000's =
>> Power
>> >>>> Supply?
>> >>>>>>=20
>> >>>>>> Richard,
>> >>>>>>=20
>> >>>>>> Welcome to the world of high power. How do you have the radio
>> >>>>>> grounded? How close is the antenna to the operating position?
>> >>>>>>=20
>> >>>>>> I would invest in some ferrites. E-bay is a good source. I =
>> would
>> >>>>>> clamp the AC line to the power supply, and the 12 vdc line =
>> coming
>> >> out.
>> >>>>>> Also clamp everything connected to the radio/amp (coax, =
>> power,
>> >>>>>> control cables, etc.). The other school of thought is to only =
>> clamp
>> >>>>>> things until you find the one that is the problem.
>> >>>>>>=20
>> >>>>>> If your antenna is 5 feet from your operating position, things =
>> may=20
>> >>>>>> be more problematic. As Ron suggests, antenna/feedline/balun =
>> may=20
>> >>>>>> be
>> >> the
>> >>>>>> culprit. Sometimes this stuff is hard to solve, glad you have =
>> help
>> >> on
>> >>>>>> site.
>> >>>>>>=20
>> >>>>>>=20
>> >>>>>> 73, good luck, Steve KW3A
>> >>>>>>=20
>> >>>>>> On 1/14/2016 9:48 AM, Richard B. McDonald wrote:
>> >>>>>>> Hi!
>> >>>>>>>=20
>> >>>>>>>=20
>> >>>>>>>=20
>> >>>>>>> In the process of setting up my Ameritron ALS-1306 amp with
>> >>>>>>> my=20=
>>
>> >>>>>>> Kenwood
>> >>>>>>> TS-2000 and an MFJ 998 tuner, sometimes RFI shuts down the=20
>> >>>>>>> TS-2000's power supply. My Elmer is convinced it is RFI because
>> >>>>>>> 1) it seems only to
>> >>>>>> happen
>> >>>>>>> on 20M (so far, anyway) and 2) it only happens when we
>> >>>>>>> crank-up=20=
>>
>> >>>>>>> the
>> >>>>>>> 1306 beyond ~200W. The 1306 is on a totally different, =
>> dedicated=20
>> >>>>>>> power
>> >>>>> line:
>> >>>>>>> 240V. The TS-2000's power supply is on the household's 120V.
>> >>>>>>> =20=
>>
>> >>>>>>> The power supply for the TS-2000 is an Astrin SS-30=20
>> >>>>>>> <https://www.hamcity.com/store/pc/SS-30-p363.htm> . So, what =
>> can=20
>> >>>>>>> I do to stop this?
>> >>>>>>>=20
>> >>>>>>>=20
>> >>>>>>>=20
>> >>>>>>> 73,
>> >>>>>>>=20
>> >>>>>>> Richard KK6MRH
>> >>>>>>>=20
>> >>>>>>=20
>> >>>>>=20
>> >>>>=20
|
