Re: Topband: a box of ferrites

[Michael Walker]

Thanks All

Sean, I have at least 3 printed opies of W1HIS's pdf and I totally forgot
that was in the back.  It was that article that made me a choke everything
convert.

Hence the reason I have been buying some fleamarket chokes.

Brian, I tried a jig where I would wrap about 8 turns of wire around the
choke and then sweep it with the SpecA and see how many db of attenuation I
got.  I did get results, but I could not confirm if they were accurate.

thanks, mike

On Wed, May 31, 2017 at 10:16 PM, Sean Waite  wrote:

> W1HIS talks about how to identify ferrites in appendix 1 of this doc:
> http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
>
> -Sean WA1TE
>
> On Wed, May 31, 2017 at 9:51 PM Michael Walker 
> wrote:
>
>> This group is clearly one of the most technical groups around and if this
>> off topic enough, please kill it.
>>
>> The question is that if you have a box of ferrites with no labels on them,
>> how could you measure their ability to be used as a choke.  Yes, you could
>> measure them and look them up assuming they came from one vendor.
>>
>> You have the usual ham tools plus a spectrum analyzer with a tracking
>> generator.
>>
>> Does anyone have a tried and true method for determining what their
>> choking
>> impedance might be?
>>
>> Mike va3mw
>> _
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>
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Topband: Sorry for Cross Post

[Charlie Young]

I accidentally posted a reply to Topband that was intended for the Amps 
Reflector.   Sorry about the error.   I will blame it on Mail for Windows 10, 
which we just started using.

73 Charlie N8RR
Sent from Mail for Windows 10

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Topband: a box of ferrites

[Michael Walker]

This group is clearly one of the most technical groups around and if this
off topic enough, please kill it.

The question is that if you have a box of ferrites with no labels on them,
how could you measure their ability to be used as a choke.  Yes, you could
measure them and look them up assuming they came from one vendor.

You have the usual ham tools plus a spectrum analyzer with a tracking
generator.

Does anyone have a tried and true method for determining what their choking
impedance might be?

Mike va3mw
_
Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: [Amps] RF-KIT SS AMP

[Michael Walker]

I have one on order for my remote station.  The LPF is included.

Mike va3mw


On Wed, May 31, 2017 at 9:33 PM, Charlie Young  wrote:

> Tim, thanks for that info.
>
> On an unrelated topic, I am working on a big project here and needed some
> last minute supplies that are not available locally.  Ordered the needed
> material from DX Engineering and it was here today in WV, the next day
> after I placed the order.  Fantastic service that moved my project along on
> schedule (4 x 7 el 6M EME array).  Same for my low band rx supplies last
> fall.  Fantastic service.  Thanks to your staff.
>
> 73 Charlie N8RR
>
> Sent from Mail for
> Windows 10
>
> From: Tim Duffy
> Sent: Wednesday, May 31, 2017 9:16 PM
> To: w...@comcast.net; 'Jim W7RY' jimw...@gmail.com>; 'Jim Monahan';
> a...@contesting.com
> Subject: Re: [Amps] RF-KIT SS AMP
>
> I have talked to them SINCE Dayton.
>
> LPF IS INCLUDED - pay no attention to the web page.
>
> 73
> Tim K3LR
>
> -Original Message-
> From: Amps [mailto:amps-boun...@contesting.com] On Behalf Of
> w...@comcast.net
> Sent: Wednesday, May 31, 2017 9:12 PM
> To: Jim W7RY; Jim Monahan; a...@contesting.com
> Subject: Re: [Amps] RF-KIT SS AMP
>
> Hello Jim,
>
> Read the web page on it, it says no LPF as well as a few other items are
> missing.
>
> I built one from the Russian guys and I am happy with it, but you will be
> suppressed on how many things you will have to build and add to the mix.
>
> 73, Bruce, W8HW
> ===
>
> -Original Message-
> From: Jim W7RY
> Sent: Wednesday, May 31, 2017 21:04
> To: w...@comcast.net ; Jim Monahan ; a...@contesting.com
> Subject: Re: [Amps] RF-KIT SS AMP
>
> It most certainly does include a LPF! I also talked to them at Dayton. A
> built in tuner is an option.
>
> Seems to me the kit without the tuner was around $2600.00
>
> 73
> Jim W7RY
>
>
> -Original Message-
> From: w...@comcast.net
> Sent: Wednesday, May 31, 2017 8:48 AM
> To: Jim Monahan ; a...@contesting.com
> Subject: Re: [Amps] RF-KIT SS AMP
>
> It is also missing LPF (Low Pass Filter) and that is most important, You
> will need a minimum of 6 filters. Additionally you will need either a 6
> position wafer switch or will need to build communication path to you your
> exciter for filter selection. Perhaps other hardware.
>
> 73, Bruce, W8HW
> =
>
> -Original Message-
> From: Jim Monahan
> Sent: Wednesday, May 31, 2017 08:26
> To: a...@contesting.com
> Subject: [Amps] RF-KIT SS AMP
>
> With all of the discussion recently about SS amps, here
> is one that might be worth checking out:
>
> http://rf-kit.de/en/2k_Kit.php
>
> RF-KIT, a firm based in Germany, was exhibiting a legal-limit HF Amplifier
> Kit at the Hamvention. The unit on display was using two LDMOS power
> devices
> and sported a 7" color touchscreen for amplifier control and status. The
> kit
> includes everything necessary to build the amplifier except the Raspberry
> Pi
> 3 CPU, and three fans. The company's literature states that it can be built
> in less than a day.
>
> Jim, K1PX
>
> K1PX at msn.com
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>
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>
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Re: Topband: [Amps] RF-KIT SS AMP

[Charlie Young]

Tim, thanks for that info.

On an unrelated topic, I am working on a big project here and needed some last 
minute supplies that are not available locally.  Ordered the needed material 
from DX Engineering and it was here today in WV, the next day after I placed 
the order.  Fantastic service that moved my project along on schedule (4 x 7 el 
6M EME array).  Same for my low band rx supplies last fall.  Fantastic service. 
 Thanks to your staff.

73 Charlie N8RR

Sent from Mail for Windows 10

From: Tim Duffy
Sent: Wednesday, May 31, 2017 9:16 PM
To: w...@comcast.net; 'Jim 
W7RY'; 'Jim Monahan'; 
a...@contesting.com
Subject: Re: [Amps] RF-KIT SS AMP

I have talked to them SINCE Dayton.

LPF IS INCLUDED - pay no attention to the web page.

73
Tim K3LR

-Original Message-
From: Amps [mailto:amps-boun...@contesting.com] On Behalf Of
w...@comcast.net
Sent: Wednesday, May 31, 2017 9:12 PM
To: Jim W7RY; Jim Monahan; a...@contesting.com
Subject: Re: [Amps] RF-KIT SS AMP

Hello Jim,

Read the web page on it, it says no LPF as well as a few other items are
missing.

I built one from the Russian guys and I am happy with it, but you will be
suppressed on how many things you will have to build and add to the mix.

73, Bruce, W8HW
===

-Original Message-
From: Jim W7RY
Sent: Wednesday, May 31, 2017 21:04
To: w...@comcast.net ; Jim Monahan ; a...@contesting.com
Subject: Re: [Amps] RF-KIT SS AMP

It most certainly does include a LPF! I also talked to them at Dayton. A
built in tuner is an option.

Seems to me the kit without the tuner was around $2600.00

73
Jim W7RY


-Original Message-
From: w...@comcast.net
Sent: Wednesday, May 31, 2017 8:48 AM
To: Jim Monahan ; a...@contesting.com
Subject: Re: [Amps] RF-KIT SS AMP

It is also missing LPF (Low Pass Filter) and that is most important, You
will need a minimum of 6 filters. Additionally you will need either a 6
position wafer switch or will need to build communication path to you your
exciter for filter selection. Perhaps other hardware.

73, Bruce, W8HW
=

-Original Message-
From: Jim Monahan
Sent: Wednesday, May 31, 2017 08:26
To: a...@contesting.com
Subject: [Amps] RF-KIT SS AMP

With all of the discussion recently about SS amps, here
is one that might be worth checking out:

http://rf-kit.de/en/2k_Kit.php

RF-KIT, a firm based in Germany, was exhibiting a legal-limit HF Amplifier
Kit at the Hamvention. The unit on display was using two LDMOS power devices
and sported a 7" color touchscreen for amplifier control and status. The kit
includes everything necessary to build the amplifier except the Raspberry Pi
3 CPU, and three fans. The company's literature states that it can be built
in less than a day.

Jim, K1PX

K1PX at msn.com
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Topband: CQ 160 Contest photos wanted

[Andy Blank]

Did you participate in the CQ160 2017 Contest?

Do you have any photos you can share for the writeup?

Please send to me directly and I will see if we have room.

Please only send if you have never been featured before.


Thanks, 73

Andy N2NT
Director CQ160 Contest
andyn...@gmail.com
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