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Author Topic: Equipment ID - request assistance  (Read 2206 times)
N7ELC
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Posts: 5




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« on: September 25, 2017, 05:26:29 AM »

I was gifted my first HF rig by a nice lady who hadn't ham'd in years and needed help getting a huge beam down from the tower at her house. It came with a box full of doodads, most of which I've identified. I just can't figure these two out. The black one has threaded posts for what I assume is installing a wire antenna, maybe a balun? The aluminum yoke is pretty much all rivets with UHF connectors on each end, maybe a polyphaser of sorts.

Any leads would be much appreciated, thanks y'all.



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W9IQ
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Posts: 1706




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« Reply #1 on: September 25, 2017, 05:36:39 AM »

The first one looks like an HF low pass filter.

- Glenn W9IQ
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- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
NK7Z
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« Reply #2 on: September 25, 2017, 05:39:54 AM »

The second item, black in color is a balun for a beam...  Probably a 1:1, probably made by HyGain.
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Thanks,
Dave
For reviews and setups see: http://www.nk7z.net
K0UA
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« Reply #3 on: September 25, 2017, 05:49:25 AM »

Yep, on both.
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N7ELC
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« Reply #4 on: September 25, 2017, 02:03:31 PM »

Sheesh, what happened to my google-fu there? You're right on both, so last question is where the filter would come in handy. CW I presume? Thanks.
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K0UA
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« Reply #5 on: September 25, 2017, 02:14:22 PM »

Sheesh, what happened to my google-fu there? You're right on both, so last question is where the filter would come in handy. CW I presume? Thanks.

Well, any mode.   A low pass filter is a device that passes a certain "band" of frequencies with very little attenuation and has a "cut off" frequency where above that frequency, it has a very high attenuation.  That one in your hand likely has a cut off frequency of around 40 MHZ.  Its purpose was to keep harmonics of a low band transmitter (below 30 mhz) from escaping up the coax and being radiated out to possible interfere with your neighbor's television set. They were very common "back in the day", and that one looks like all the other brands that people used. I still have one made by "Drake" around here somewhere. It's sole purpose is to clean up a possible dirty transmitter with next to no insertion loss of the frequencies it is designed to pass.
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KS2G
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Posts: 732




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« Reply #6 on: September 25, 2017, 06:24:13 PM »

The black one appears to be a Hygain BN-86 balun.
Commonly used/recommended for all of their beam antennas.
You can download the user manual at:
http://www.hy-gain.com/support.php?productid=BN-86

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G3RZP
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« Reply #7 on: September 26, 2017, 07:03:23 AM »

I think MFJ still make them. They do make sure that you don't have problems with harmonics in the FM BC band, which is the reason I have one.
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KC4ZGP
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Posts: 1637




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« Reply #8 on: September 26, 2017, 01:34:39 PM »

Low-pass filters are chick magnets. Women don't dig baluns.

You didn't know that did you.

That's why I'm here.

Homeward, 1.815MHz, Morse, 2200UTC.

Kraus
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NZ4Z
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« Reply #9 on: October 05, 2017, 08:55:41 PM »

Well...... after looking hard, it came down to the $$$...... But I feel i'll be happy.  I ordered the Mosley Pro-67-C.  Thanks for all the comments.

73
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