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Harris TNC antenna in Waris handhelds?

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mrs1
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Harris TNC antenna in Waris handhelds?

Postby mrs1 » Fri Jun 08, 2018 12:51 am

Hello,

I'd like to test the performance of a Harris antenna (RF-3150-AT152), which is a foldable 48.5" design, with some GP380 (HT1250) handheld radios. The radios are low band (29.7–42MHz).

Is anyone aware of any adapter allowing a TNC antenna on the Waris series radios?

The GP380/HT1250 use MX type connector or SMA? I've read posts mentioning one or the other... By looking at the Motorola BNC adapter #HLN9756, it seems to be a male SMA?

Image


Thanks!

Mike

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Re: Harris TNC antenna in Waris handhelds?

Postby NSPD » Sat Jun 09, 2018 5:12 am

They have an MX Connector. If you find an adapter let me know i’ve been looking. Best option may be an antenna separation kit.
Jake

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Re: Harris TNC antenna in Waris handhelds?

Postby mrs1 » Sat Jun 09, 2018 8:30 am

Another less desirable alternative would be using the Motorola adapter above followed by a BNC to TNC adapter...

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Re: Harris TNC antenna in Waris handhelds?

Postby NSPD » Mon Jun 11, 2018 3:18 pm

I think attaching one of those giant whip antennas to an HT1250 in itself (assuming you had an antenna with a native MX connector) would put an excessive amount of stress on the antenna jack. Even more so with two adapters.

I’m assuming this isn’t an application where the radio could be separated from the antenna with a cable, I.e. body armor.
Jake

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Re: Harris TNC antenna in Waris handhelds?

Postby mrs1 » Tue Jun 12, 2018 8:11 am

No, I wasn't thinking of separating the antenna from the radio.

I'll buy two adapters while I'm searching for a single adapter and see how well it works. I'll post a pic of the setup.

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escomm
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Re: Harris TNC antenna in Waris handhelds?

Postby escomm » Wed Jun 13, 2018 7:02 am

It's an MX threaded adapter but not an MX flat base. OP's pic looks a lot like the OEM RF adapter for the Waris radios

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Re: Harris TNC antenna in Waris handhelds?

Postby mancow » Wed Jul 18, 2018 6:43 pm

It won't work well and depending on how it's adapted might now work at all. The base of the Harris antenna has a series of matching components to try to keep it relatively low (well usable) SWR in the Vhf low areas. They need a ground reference. That adapter posted is for a GP type of radio with the headphone type jack used for RF.

The closest would be this but you still need to find a ground since the ground is isolated due to the plastic housing. You would have to fabricate something.

Image

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Re: Harris TNC antenna in Waris handhelds?

Postby mrs1 » Sun Nov 25, 2018 12:22 pm

Hi,

Just tested the Harris antennas with the GP380s but the results were disappointing...

I used 2 adapters together, from GP380 to BNC and from BNC to Harris.

I placed one radio in the hands of my assistant, who was on the ground floor of a 2 storey house, and walked away with another radio. I maintained comms with either antenna up to 500m (straight line measured with Google Earth). This was in a densely populated area of 2 storey houses in a relatively flat terrain. Frequency was 29.70MHz, power setting was high.

There was no advantage in using the Harris antennas... Photos below.

Can anyone recommend a better antenna for lowband than the stock Motorola?

Mike

Image
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Re: Harris TNC antenna in Waris handhelds?

Postby mrs1 » Mon Nov 26, 2018 2:44 pm

Just tested 2 WIMO (Germany) 10meter telescopic antennas using the BNC adapter, under the same conditions as above. Result was also the same... lost comms at the same spot. Extended length is 140cm.

Photos of the setup below.

Image
Image

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Re: Harris TNC antenna in Waris handhelds?

Postby abbylind » Tue Dec 04, 2018 8:18 am

Could be a ground plane issue with the Waris and those antennas. A field strength meter would be helpful. You could use a VOM with a diode between the leads for a crude measurement device

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Re: Harris TNC antenna in Waris handhelds?

Postby mrs1 » Tue Dec 04, 2018 2:38 pm

I can repeat the tests with a cointerpoise. What length would you recommend?

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Re: Harris TNC antenna in Waris handhelds?

Postby d119 » Wed Dec 05, 2018 8:55 am

I would put a wire counterpoise off of the ground side of the antenna trailing along the ground and see what you get.


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