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  #21 (permalink)  
Old 07-10-2018, 12:02 PM
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FYI the Remtronix 800 MHz antenna is also sold under the Alinco brand name as Alinco REM-800B (BNC) and Alinco REM-800S (SMA).

Alinco REM-800B (BNC) $24.95 at MTC Radio: https://www.mtcradio.com/alinco-rem-...bnc-connector/
Alinco REM-800B (BNC) $24.99 at DX Engineering: https://www.dxengineering.com/parts/alo-rem-800b

Alinco REM-800S (SMA) $24.95 at MTC Radio: https://www.mtcradio.com/alinco-rem-...sma-connector/
Alinco REM-800S (SMA) $24.99 at DX Engineering: https://www.dxengineering.com/parts/alo-rem-800s
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  #22 (permalink)  
Old 07-10-2018, 12:34 PM
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Quote:
Originally Posted by hiegtx View Post
I suspect that the 'slightly better' reception on your R/S 800MHz antenna as opposed to your Remtronix version is due more to variances in the individual antennas, rather than the 'design' of one versus the other...
Agreed, maybe my post wasn't clear, I was attributing all of my observations to manufacturing variability.
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  #23 (permalink)  
Old 07-11-2018, 12:21 AM
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I just got a Watson W-801. So far I am enjoying it.


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  #24 (permalink)  
Old 07-11-2018, 7:00 PM
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I just got my Remtronix antenna from Airspy. I am listening to the Fairfax County and Loudoun County 800mhz trunked systems. The Remtronix is not receiving better than the stock antenna on the SDS100. Seems like the pin inside the antenna does not protrude as far as the stock antenna. It still makes a connection, but clearly does receive better than the stock antenna.



The Remtronix antenna does receive better than the stock antenna on the BCD436HP listening to the same systems.
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  #25 (permalink)  
Old 07-11-2018, 7:38 PM
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Quote:
Originally Posted by rbuxton View Post
I just got my Remtronix antenna from Airspy. I am listening to the Fairfax County and Loudoun County 800mhz trunked systems. The Remtronix is not receiving better than the stock antenna on the SDS100. Seems like the pin inside the antenna does not protrude as far as the stock antenna. It still makes a connection, but clearly does receive better than the stock antenna.



The Remtronix antenna does receive better than the stock antenna on the BCD436HP listening to the same systems.

I placed a SMA/SMA adapter on the SDS100 then attached the Remtronix antenna to the adapter and it works as well as the stock antenna. Not better. The pin in the Remtronix antenna makes a better connection with the SMA adapter than it does the SDS100. And the SMA adapter makes a better connection with the SDS100 than the Remtronix antenna.



So in summary, I'll stick with the stock antenna on the SDS100.



Back to monitoring.
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  #26 (permalink)  
Old 07-12-2018, 4:48 AM
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Quote:
Originally Posted by rbuxton View Post
I placed a SMA/SMA adapter on the SDS100 then attached the Remtronix antenna to the adapter and it works as well as the stock antenna. Not better. The pin in the Remtronix antenna makes a better connection with the SMA adapter than it does the SDS100. And the SMA adapter makes a better connection with the SDS100 than the Remtronix antenna.



So in summary, I'll stick with the stock antenna on the SDS100.



Back to monitoring.
That's interesting. I get at least -10db better RSSI when using the BNC RS800 antenna and the Uniden supplied SMA-BNC adapter. I also own a Remtronix 800 SMA antenna, and tried a SMA-SMA adapter to extend above the SDS100's weather seal , but the adapter didn't fit properly / was slightly wobbly. Is it *possible* that your SMA-SMA adapter may not be seating properly? Perhaps you can run a test between the stock and Remtronix antennas, and report back with the RSSI values for each. That would be helpful for other evaluating their purchasing decisions.
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  #27 (permalink)  
Old 07-13-2018, 11:47 AM
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Quote:
Originally Posted by maus92 View Post
That's interesting. I get at least -10db better RSSI when using the BNC RS800 antenna and the Uniden supplied SMA-BNC adapter. I also own a Remtronix 800 SMA antenna, and tried a SMA-SMA adapter to extend above the SDS100's weather seal , but the adapter didn't fit properly / was slightly wobbly. Is it *possible* that your SMA-SMA adapter may not be seating properly? Perhaps you can run a test between the stock and Remtronix antennas, and report back with the RSSI values for each. That would be helpful for other evaluating their purchasing decisions.

The SMA/SMA adapter does seat properly. The Remtronix does not.



The adapter with the Remtronix antenna shows a signal that is -10db better than the Remtronix antenna by itself.
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  #28 (permalink)  
Old 07-13-2018, 4:20 PM
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Quote:
Originally Posted by rbuxton View Post
The SMA/SMA adapter does seat properly. The Remtronix does not.



The adapter with the Remtronix antenna shows a signal that is -10db better than the Remtronix antenna by itself.
What are the RSSI values comparing the stock antenna vs. the Remtronix using the SMA-SMA adapter?
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  #29 (permalink)  
Old 07-14-2018, 2:08 PM
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Quote:
Originally Posted by maus92 View Post
What are the RSSI values comparing the stock antenna vs. the Remtronix using the SMA-SMA adapter?

Listening to the Fairfax County (VA) 800 trunked system on an SDS100.
Stock antenna: RSSI -77dBm
Remtronix antenna: RSSI -97dBm
Remtronix antenna attached to SMA adapter: RSSI -45dBm


Listening to the United Airlines Dulles Airport 900 DMR trunked system.
Stock antenna: RSSI -103dBm
Remtronix antenna: RSSI -109dBm
Remtronix antenna attached to SMA adapter: RSSI -60dBm


So, on these two systems the SMA adapter/Remtronix antenna combo is best.
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  #30 (permalink)  
Old 07-14-2018, 3:23 PM
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Quote:
Originally Posted by rbuxton View Post
Listening to the Fairfax County (VA) 800 trunked system on an SDS100.
Stock antenna: RSSI -77dBm
Remtronix antenna: RSSI -97dBm
Remtronix antenna attached to SMA adapter: RSSI -45dBm


Listening to the United Airlines Dulles Airport 900 DMR trunked system.
Stock antenna: RSSI -103dBm
Remtronix antenna: RSSI -109dBm
Remtronix antenna attached to SMA adapter: RSSI -60dBm


So, on these two systems the SMA adapter/Remtronix antenna combo is best.


Rbuxton what adapter do you use? Where did you get it?


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  #31 (permalink)  
Old 07-14-2018, 3:32 PM
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Quote:
Originally Posted by rbuxton View Post
I placed a SMA/SMA adapter on the SDS100 then attached the Remtronix antenna to the adapter and it works as well as the stock antenna. Not better.
So, I take it you recognize it is in fact better now that you've noted the signal strength.

Quote:
Originally Posted by rbuxton View Post
The pin in the Remtronix antenna makes a better connection with the SMA adapter than it does the SDS100.
There have been multiple antenna threads for the SDS, all of which mention that the SMA version of the Remtronix 800 MHz antenna is incompatible with the SDS's recessed connector. I have one and it makes zero contact with the center pin. Just FYI (ICYMI), using an SMA-SMA adapter isn't recommended - you'll put a lot less strain on the scanner's SMA connector by using the BNC version of that antenna and the adapter that came with the SDS.
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  #32 (permalink)  
Old 07-14-2018, 3:49 PM
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Quote:
Originally Posted by mike1988 View Post
Rbuxton what adapter do you use? Where did you get it?...
This SMA Male to SMA Female Port Extender Adapter was mentioned for use with the SDS100 in other threads here on RR: https://www.ebay.com/itm/SMA-Male-to...L/221584357640
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  #33 (permalink)  
Old 07-15-2018, 1:07 PM
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Quote:
Originally Posted by AvidHiker View Post

There have been multiple antenna threads for the SDS, all of which mention that the SMA version of the Remtronix 800 MHz antenna is incompatible with the SDS's recessed connector. I have one and it makes zero contact with the center pin. Just FYI (ICYMI), using an SMA-SMA adapter isn't recommended - you'll put a lot less strain on the scanner's SMA connector by using the BNC version of that antenna and the adapter that came with the SDS.

I must have glossed over that part.
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  #34 (permalink)  
Old 07-15-2018, 3:03 PM
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Quote:
Originally Posted by AvidHiker View Post
...Just FYI (ICYMI), using an SMA-SMA adapter isn't recommended - you'll put a lot less strain on the scanner's SMA connector by using the BNC version of that antenna and the adapter that came with the SDS.
Quote:
Originally Posted by rbuxton View Post
I must have glossed over that part.
I would imagine it would be more of an issue using an SMA-to-SMA extender adapter (like I linked to above in my post #32) if you frequently take your scanner out and about where it would be subject to drops/bumps and/or wear it on your belt where the antenna may get flexed somewhat. If you use it primarily in a stationary location (like at your home) and are not frequently changing antenna connections, I don't think that using the SMA-to-SMA extender adapter would cause any problems with the SDS100's mounted SMA connector.
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  #35 (permalink)  
Old 07-17-2018, 9:05 AM
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Quote:
Originally Posted by trp2525 View Post
I would imagine it would be more of an issue using an SMA-to-SMA extender adapter (like I linked to above in my post #32) if you frequently take your scanner out and about where it would be subject to drops/bumps and/or wear it on your belt where the antenna may get flexed somewhat. If you use it primarily in a stationary location (like at your home) and are not frequently changing antenna connections, I don't think that using the SMA-to-SMA extender adapter would cause any problems with the SDS100's mounted SMA connector.

As it stands for the immediate future I'll be using the radio only in my home with the SMA/SMA adapter and the Remtronix antenna. Seems to be working pretty good.



If I hit the trail with the radio I would definitely use the stock antenna or buy the SMA/BNC adapter and a newly purchased BNC Remtronix antenna.


Back to monitoring.......
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  #36 (permalink)  
Old 07-17-2018, 9:19 AM
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noaim - the BEST overall scanner antenna is the 800Mhz one from Radio Shack other than that the DIAMOND antenna RH77CA is quite good but expensive. you should also consider the Radio Shack telescoping HAM radio antenna , while NOT a rubber duck, its just 6" closed and 26" fully extended, best of ALL you can tune the antenna to the BAND you are listing to, its also a Center Loaded antenna so no Ground Plane is needed when operating. It has very High Gain for a general coverage antenna.
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Old 07-17-2018, 11:29 AM
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Quote:
Originally Posted by hardsuit View Post
...the DIAMOND antenna RH77CA is quite good but expensive...
FYI The Antenna Farm has the Diamond RH77CA (and the SMA version SRH77CA) for $17.95 which is an excellent price from a Diamond authorized dealer (https://www.diamondantenna.net/dealers.html).

Link to Diamond RH77CA at The Antenna Farm: https://www.theantennafarm.com/catal...nd-rh77ca-4968

Link to Diamond SRH77CA at The Antenna Farm: https://www.theantennafarm.com/catal...d-srh77ca-4983
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