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  #11  
Old 01-19-2011, 09:08 PM
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The cheapest adapter will only have 1-2db insertion loss. 15 db? I doubt it. Even at 2db it's mach's nix if you bugger threads on the SMA rendering the radio useless. A well made adapter, with a wide base, will reduce the amount of torque to the SMA connector.
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  #12  
Old 01-21-2011, 01:09 PM
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Quote:
Originally Posted by DaveInDenver View Post
P I would be surprised if a SMA-BNC adapter had even 2dB of loss. No way they have 15dB, that seems like a dropped decimal and was maybe 1.5dB. Just one man's opinion.
I hate using this forum on my crackberry, sorry for missed decimal.
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  #13  
Old 01-21-2011, 01:13 PM
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Quote:
Originally Posted by DaveInDenver View Post
Yeah, found what I was looking for.

http://www.minicircuits.com/pdfs/SM-BF50+.pdf

"Insertion Loss (dB) 0.05 (typ)"

That's from DC to 2GHz.
That's about the same design as the one I looked at so many years ago, pretty narrow o.d. and not much support at the screw collar. Attenuation is way better than what HRO quoted me tho.
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  #14  
Old 01-21-2011, 07:38 PM
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Dave,

Thanks for posting up that picture of the diamond adapter. I have been using the style shown in your first picture. The j-poles we made were attached with pre-installed bnc connectors to double shielded coax. I'll try and find the Diamond style.
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  #15  
Old 01-31-2011, 08:35 AM
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Default VX3r vs. VX-7r

I have noticed a significant different in receiving capability, VX-3r to VX-7r. I have one of those longer Diamond antennas that greatly improves send/receive quality. I also have an antenna on my roof, a portable J-pole, point being I've tested this with a variety of antennas. Bottom line, the VX-3r does not receive as well as the VX-7r.

Can anyone explain this? I had been under the naive impression that their performance difference would be on the transmit end, since the 3 has so much less power. But I can screw the rubber duck to the 7, and the better Diamond to the 3, and the 7 hears the Colorado Connection repeater tone while the 3 just sits there. When I connect either my J-pole or homebrew roof antenna to the HT's, I consistently receive signal reports that the 7 is better... ok that makes sense but when they transmit back I hear the same thing. The Vx-3R does not receive as well as the VX-7r.

I still think the little 3 is a great portable trail/camp radio, and it has met every need I've come across in those situations. I'll continue to recommend it for a "second radio," once you've got a solid 2m mobile big in your truck. But I'm a little disappointed in its receive capability, compared to the VX-7r.
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  #16  
Old 01-31-2011, 09:10 AM
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Yeah that makes sense Dave, and out in Moab or in my pocket out on the trail it's the perfect little radio. But in my basement, when I can keep all other variables constant, the difference is significant.. not the best 2m base station platform.
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  #17  
Old 01-31-2011, 09:46 AM
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Wouldn't receive performance be somewhat related to (battery) power as well? The vx3r would have less power to work with since the battery is so much smaller as well right? I know that my bendix radio I use for Forest service work is definitely worse at receiving and transmitting a signal when the battery isn't fresh.
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  #18  
Old 02-02-2011, 01:26 PM
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Thanks, Dave, I'll read through this tonight or tomorrow night when I have more time..

so when you're up at 04:30 surfing around Ham Radio archives, are you up early, or still up?
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  #19  
Old 03-17-2012, 10:49 AM
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Default HRO sale Yaesu FT-250

Just saw this http://www.hamradio.com/detail.cfm?pid=H0-010075 not a bad price for that radio. I have an FT-250, a VX6R and one of d'em Wuoxun dual banders. I'd have to say, the ft-250 is probably my favorite of all of them due to the simplicity and upward facing screen.
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