Date   

source for HF2V mechanical parts like screws, washers and nuts?

Tom, DL1HBT
 

Hi folks!

My old HF2V needs refurbishment, so I am desperately seeking 8-32x*** screws and nuts as well as #8 washers. 
Ok, I will surely get them over here in EU, but I do not need 25+ of each item ;-) Any idea?
vy73/55, Tom


Re: Refurbishing HV-6 to HV-2

Clark WU4B
 

John,

Thanks for heads-up on the increased height.  I am replacing the top 4 tubes due to damage and to get the additional height for 31’.  
--
73, 

Clark, WU4B


Re: HF9V-X rebuild completed.

Luc EA8AM
 

Felicitaciones Charles. 
Me alegra que hayas podido devolver la vida a la antena.

73 Luc


Re: HF9V Insulator Question.

Luc EA8AM
 

Thanks to Al, I
am making the resonators, both for 15 meters and 6 meters (the latter, I didn't have it), with rigid aluminum rods, instead of cable. 
I hope that in this way, they do not break with the movement of the antenna. 
Indeed Al, that is what I thought, the upper anchor short with the antenna and the remaining isolated. 
Then, I will have to add some radials, as the antenna is up I will put one or two radials per band, which allows me the space of the roof, I think that with lengths of 10 meters and 20 meters of cable, it could work. 
Greetings to all and have a good day.
73 Luc


Re: HF9V Insulator Question.

 

Luc,
that is correct.  The sections are shorted quarter wave stubs.  A shorted quarter wave section reflects an open circuit at the open end.  For six meters and 15 meters the section isolates the antenna above the open. 
--
Al
WB9UVJ


Re: HF9V Insulator Question.

Luc EA8AM
 

Hi.
Since you are talking about isolators, my antenna came without the 6 meter kit, I am going to make one.
The question is for the 6 meter resonator and the 15 meter one, the upper clamp connects directly to the antenna, the rest, the lower ones are all isolated. It's not like that?
Thank you.

Luc.


Re: HF9V Insulator Question.

 

Ken,
As I remember, the one with the holes furthest apart goes on the feedpoint.  This allows the base coil enough room to be spread.  The other one goes where the 80/40 meter parts come together and should allow enough room to fit the clamp without touching either the upper or lower tube.
The spacing is not that critical  I was able to purchase some fiberglas rod of the right diameter and replaced mine myself a few years ago.
--
Al
WB9UVJ


HF9V Insulator Question.

Ken WB8VTW
 

Rebuilding an HF9V and I bought new fiberglass insulators. Which insulator goes where as the 2 insulators have different hole spacing? I cannot use the original for comparison as they may not have been in the proper location either. 


Re: Dynamic 160m SWR

Eduardo PY1EB
 

Thank you, Fernando.
Very interesting your comment.



On Sun, Oct 18, 2020 at 05:01 PM, Fernando Martinez wrote:
EC3A


TBR-160S

Brent WB4X
 

I am looking to buy a TBR-160s the 160 meter add on kit for the HF9 butternut antenna. If you have one in excess please contact me.
--
Charles  WB4X


Re: Dynamic 160m SWR

Fernando Martinez
 

Hi,

I have been a user of the HF6V and HF9V verticals since the mid 80's.

I have always had the frequency offset at 160 due to heating up from the 200pf capacitors. Transmitting in CW the effect is acceptable but is much more pronounced when transmitting in digital modes. I also see the problem in the 80m and 30m band although the effect is much less. The problem is due to the temperature coefficient of the condensers. Thus, for example, the HEC HT57 condensers used in the 160 meter kit are of the N750 type (varies -750 ppm / ºC). Ideally, have NP0 type capacitors. ( see https://forum.digikey.com/t/understanding-ceramic-capacitor-temp-coefficients/727)

A few months ago I had to replace the parallel set of the two 200pf capacitors. I have used several alternatives. The best, although not the most economical, is to replace it with a set of vacuum condensers (i.e 200 + 200 pf cheaper that one of 400pf). At present I am using a Russian origin 470pf 15KV - 45KVar capacitor. They are economical and efficient. I attach the link where you can buy them. To take advantage of the shipping price, I recommend that you also take the opportunity to buy other condensers that you may need, such as those of 68pf.

https://tubes-store.com/product_info.php?cPath=35_40&products_id=948

Fernando , EC3A ( ex EA3KU since mid 1980 till january 2020, EC3AT 1979-1980 ).



K15Y-1 15kV 470pF 40kVar ceramic HV doorknob capacitor



Re: HF9V New Installation Started - 09/03/20 ... UPDATE: 10/17/20

 

Nolan,
Remind your lawn crew to not aerate your backyard in the spring as the machine will cut through your radials.
--
Al
WB9UVJ


Re: HF9V New Installation Started - 09/03/20 ... UPDATE: 10/17/20

Nolan - KI5IO
 
Edited

Been working small steps at a time with my new HF9V installation.  I've had my share of "medical issues" this summer.  One week after finishing my Cardiac Rehab I twisted my back (as I was working on adjusting and tuning my HF9V) and got hit with one helluva painful sciatica issue.  Chiropractor and some muscle relaxers at least have me able to 'walk' again after a month.

Anyway ... ~45 radials in place in my restricted location for the HF9V.

Image with short mast just shows a reasonable good (plumb) alignment as one looks against my vertical fence boards.  I dug the hole, dropped in some gravel and packed the BUT-MPS in place. My soil is a clay mixture so holds the antenna quite well.  I'll be putting in some guy lines as well just to help minimize the sway.

Have not yet weather-proofed the connector points as I have a Balun Designs balun on order and once Bob is able to get product in he will build and ship.  His supply chain has been impacted by the Covid situation as the plastics used for his boxes is also what is being used for PPE manufacture.

Rough tuning has been done and I've been making Q's (CW and 'some' FT8) on 20, 30 and 40.  I've not yet done any setup for 12 & 17, but will work on them in the next month.  I am planning on doing more tuning for 20, 30 & 40.  Need to work with neighbor as they told me they were getting some interferance when I was on 30m doing some FT8.  I have two TVs closer to the HF9V than the neighbors and I didn't see any, but no matter.  Will work it out.

I've used a six-inch high irrigation valve box to protect the radial plate, coax, coil and such at the base of the antenna. I'm not planning on securing to grade as having it sit on the radials and grass around the radial plate will provide needed protection from lawn crew and their weed-eater.

The lawn crew did not vacuum up any radials with their mowers so I was relieved after they did their first pass.  I did show and tell them about the radials so they were aware before they started.

Here is a link to some JPGs I've added to my folder:  https://groups.io/g/Butternut/album?id=253109 

--

73  -  ki5io
Nolan Kienitz
Plano, TX


Re: Dynamic 160m SWR

Eduardo PY1EB
 

Hi Luc.
Yes, my problem is the cost of transportation like you.
 
About the 68pF capacitor that you bought, I have one and works great. The problem is the 400pf (200+200) installed on the feed point of the antenna for 160m ressonance.
Maybe if we divide the current passing through the capacitor we can reduce the temperature drift. 8 capacitors of 50pf in parallel is 400pF we need. But we cannot forget the voltage isolation.
Where can we find small 50pF/15kVdc capacitors to assembly?

73.


Re: Old manuals for HF-9V

Larry WB6BBB
 

Perhaps these document will be of assistance:

Butternut HF9V Assembly Instructions:
http://kj6yvt.com/Butternut%20Instructions%20HF9V%20HF%20Vertical%20antenna%20covering%2010,%2012,%2015,%2017,%2020,%2030,%2040%20and%2080%20meters_00408IZV.pdf

Parts list: http://kj6yvt.com/Butternut_hf9v_parts_list_00649ZZV.pdf



On Sun, 11 Oct 2020 20:30:05 -0700, "Phil KB6MW"
<phildeaver@...> wrote:

I have an old HF-9V antenna and some of the top tubes are 36" long instead of 48" like the manual states. (the bottom tube is two 24" tubes instead of the indicated 48")  The very top tube matches the manual (36") but the next 4 tubes are all 36". I'm wondering if someone has an old manual that might match my antenna. I'm not sure of the vintage of my antenna but it's new to me. I've searched the internet and the butternut groups.io files section without success.
Thanks,
Phil WR7T (ex KB6MW)


Re: Dynamic 160m SWR

Luc EA8AM
 

Hi.
The problem with the capacitors that Butternut sells is the cost of transportation.
I understand that they are very good, for example these:

https://www.dxengineering.com/parts/but-290-07a
 
 
The shipment to my town is higher than the cost of the product, the total is $ 170.
 

When it arrives I try it, and I will see if it works, if not, I have not lost so much either.
It is taking risks.
 
If not, there is no other choice but to go through the hoop, and ask for the originals, although I have heard that the substitutes work for many.

73 de EA8AM


Re: Dynamic 160m SWR

David Hallidy
 

He's in Russia, or Ukraine, or one of those places.  There's nothing "wrong" with the capacitor per se, it's just not suitable for our application.  Read the description of what it's intended use is and you'll see what I mean.
He was fair to deal with and shipped quickly, it's just not the right part for the job.
Dave K2DH 



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: Tim N8NEU <t.m.kelly@...>
Date: 10/15/20 13:04 (GMT-05:00)
To: Butternut@groups.io
Subject: Re: [butternut] Dynamic 160m SWR

So where is this company located? I see no address or phone number to contact them personally. On their website under "Contact Us" they only accept emails. This kind of company I would be leary of IMHO.

73

Tim - N8NEU
FN00ah



-------- Original message --------
From: Luc EA8AM <canaryluc@...>
Date: 10/15/20 11:58 (GMT-05:00)
To: Butternut@groups.io
Subject: Re: [butternut] Dynamic 160m SWR

Looking on the internet, I found this capacitor, but I don't know if it can really be used for the butternut antenna.

http://hvstuff.com/catalogsearch/result/index/?capacitance=21&q=200+pF

 

73 de EA8AM


Re: Dynamic 160m SWR

Tim N8NEU
 

So where is this company located? I see no address or phone number to contact them personally. On their website under "Contact Us" they only accept emails. This kind of company I would be leary of IMHO.

73

Tim - N8NEU
FN00ah



-------- Original message --------
From: Luc EA8AM <canaryluc@...>
Date: 10/15/20 11:58 (GMT-05:00)
To: Butternut@groups.io
Subject: Re: [butternut] Dynamic 160m SWR

Looking on the internet, I found this capacitor, but I don't know if it can really be used for the butternut antenna.

http://hvstuff.com/catalogsearch/result/index/?capacitance=21&q=200+pF

 

73 de EA8AM


Re: Dynamic 160m SWR

David Hallidy
 

This is the same capacitor that was mentioned here a week or so ago.  I bought this capacitor and found it is much worse (more thermal drift) than the original ones.  At any power above about 50W, it starts to change value rapidly.  It was designed for use in devices other than RF tuned circuits, such as photoflash applications, plasma generation, induction heaters, etc. where tight thermal stability isn’t necessary.

73

Dave K2DH

 

From: Butternut@groups.io <Butternut@groups.io> On Behalf Of Luc EA8AM
Sent: Thursday, October 15, 2020 11:59 AM
To: Butternut@groups.io
Subject: Re: [butternut] Dynamic 160m SWR

 

Looking on the internet, I found this capacitor, but I don't know if it can really be used for the butternut antenna.

http://hvstuff.com/catalogsearch/result/index/?capacitance=21&q=200+pF

 

73 de EA8AM


Re: Dynamic 160m SWR

Luc EA8AM
 

Looking on the internet, I found this capacitor, but I don't know if it can really be used for the butternut antenna.

http://hvstuff.com/catalogsearch/result/index/?capacitance=21&q=200+pF

 

73 de EA8AM