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Watt meter/ antenna tester with digital radios

gro34wser

Newbie
Joined
Jan 30, 2018
Messages
4
Hello all.

I currently have a MFJ-847 unit and love it, but it seems to struggle a bit when the radio is broadcasting in digital. Is there a similar alternative that can handle both the analog and digital transmission?
Thanks.
 

mmckenna

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Jul 27, 2005
Messages
26,288
Location
United States
Hello all.

I currently have a MFJ-847 unit and love it, but it seems to struggle a bit when the radio is broadcasting in digital. Is there a similar alternative that can handle both the analog and digital transmission?
Thanks.

What flavor digital?

FDMA digital, like P25 Phase 1, NXDN, etc. should work just fine with a standard watt meter. I use a Bird 43 and a 4304 all the time on those.

TDMA digital, like DMR or P25 Phase 2, will give some meters a problem due to the pulsed nature of the transmission.

There are meters that will handle TDMA.
 

K9KLC

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Premium Subscriber
Joined
Mar 31, 2007
Messages
1,090
Location
Southwest, IL
Hello all.

I currently have a MFJ-847 unit and love it, but it seems to struggle a bit when the radio is broadcasting in digital. Is there a similar alternative that can handle both the analog and digital transmission?
Thanks.
What type of digital transmission?
 

K9KLC

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Premium Subscriber
Joined
Mar 31, 2007
Messages
1,090
Location
Southwest, IL
TDMA digital, like DMR or P25 Phase 2, will give some meters a problem due to the pulsed nature of the transmission.
Agreed, I've not gotten accurate readings on DMR on the 43 or most others I've tried that worked on analog and things like D-star, NXDN and Phase 1 P-25 or conventional P-25.
 

prcguy

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Jun 30, 2006
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Location
So Cal - Richardson, TX - Tewksbury, MA
A peak reading wattmeter should give closer readings in DMR and other TDMA digital modes compared to FM. However, since TDMA modes are pulsed the RMS value will be less than FM mode or FDMA modes because you will have less average power in those modes. Average reading meters are doing what they are supposed to but there is no standard among cheap meters so they will all read a little different. If you use a Bird type meter and know the pulse width and duty cycle of the TDMA mode you can make corrections for it. Not so much with an MFJ or other brand.
 
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