What does City do on a DFR7 (1 Viewer)

Redmed

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I read somewhere on this forum what city does, but can't find it again. I think it turns off x and sets K to 50% and leaves Ka at full reception is this correct?
 

NVR2FST

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I read somewhere on this forum what city does, but can't find it again. I think it turns off x and sets K to 50% and leaves Ka at full reception is this correct?
If it's like the R3 it sets K band sensitivity to 15% of max, according to what I read here.
 

Brainstorm69

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K and X band sensitivity are reduced in City mode (assuming you have X-band turned on). K-band is reduced to 18% sensitivity. I'm not sure whether anyone ever asked about the exact X-band reduction. I'd guess it's the same, but that's a guess. Ka is full sensitivity in City mode.

[EDIT - Scratch that. that's for the R series. ]
 
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NorEaster18

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I don't know what the specific percentages of sensitivity are when comparing city mode to highway mode, but two real world observations I have made by using it are:

1. It is super effective at achieving near-zero BSM falses
2. It cuts K band range down to dangerously low levels

I cannot fathom using it if you encounter legitimate K band. The few times I tested with it, I was line of sight to the source for multiple seconds before getting an alert.
 

Redmed

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I don't know what the specific percentages of sensitivity are when comparing city mode to highway mode, but two real world observations I have made by using it are:

1. It is super effective at achieving near-zero BSM falses
2. It cuts K band range down to dangerously low levels

I cannot fathom using it if you encounter legitimate K band. The few times I tested with it, I was line of sight to the source for multiple seconds before getting an alert.
Thanks, I was thinking of running in city mode to get less BSM's. Those Buicks and GMC/Chevy's are like fly's around here. Seems all these local GM employees love to take advantage of their employee discounts. When I drive on the highway I get very few BSM's but locally the DFR7 is buzzing a lot. If city mode makes K band almost useless I might take down the DFR7 and only use it for long trips. Mabe I'll put the 9500ix back up, with K band turned off, for local use. I do like the LED display of the 9500ix better. I got the DRF7 to replace the 9500ix. So far I've turned on the K filter, set to K narrow and set the Quiet Drive to 30mph. I don't know anything else to reduce the BSM's on the DFR7 short of City mode or turning K band off. I had hoped that the DFR7 in city mode would leave Ka at full sensitivity and only reduce K at 50% but if city mode make the DFR7 almost blind to K ... hum... I'll try turning on TSF but don't think that will have much effect on K band and will reduce the response of Ka.
 
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Brainstorm69

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Thanks, I was thinking of running in city mode to get less BSM's. Those Buicks and GMC/Chevy's are like fly's around here. Seems all these local GM employees love to take advantage of their employee discounts. When I drive on the highway I get very few BSM's but locally the DFR7 is buzzing a lot. If city mode makes K band almost useless I might take down the DFR7 and only use it for long trips. Mabe I'll put the 9500ix back up, with K band turned off, for local use. I do like the LED display of the 9500ix better. I got the DRF7 to replace the 9500ix. So far I've turned on the K filter, set to K narrow and set the Quiet Drive to 30mph. I don't know anything else to reduce the BSM's on the DFR7 short of City mode or turning K band off. I had hoped that the DFR7 in city mode would leave Ka at full sensitivity and only reduce K at 50% but if city mode make the DFR7 almost blind to K ... hum... I'll try turning on TSF but don't think that will have much effect on K band and will reduce the response of Ka.
TSF doesn't affect Ka at all, fyi.
 

thebravo

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City mode doesn't reduce KA as far as I know, just K and disables X. In city mode KA is still 100% I believe... and TSF helps with K falses.
 

Shodanheart

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TSF helps a lot with K band falses.

I run mine in highway mode, K filter on, TSF on.


Sent from my iPhone using Tapatalk
 

Redmed

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TSF helps a lot with K band falses.

I run mine in highway mode, K filter on, TSF on.
Thanks I'll try turning on TSF today and see if things improve.
-- Double Post Merged: --
I thought TSF just introduced a delay.
 

thebravo

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It can help with really weak transient falses, it can add a small delay on Kband as it may wait to see the signal present long enough before it alerts meaning little tiny weak blips of signal will be ignored. It helps some with falseing, I run TSF on on the R1 and it's a noticeable difference in falses. , when you have a strong source it wont squash the fales though, and of course real signals will still alert well.. now if you font face much real Kband and and your city speed limits are high enough you can also bump up quiet ride to 35-40 and it will silence Kband under that speed... if they run Kband around you and you have lower speed limits then maybe that doesn't work. Around me most of the roads are 35mph, so I have quiet ride at 40 on a redline EX (as they wont bug you for 5 over) that extra few MPH higher limit really really helps around town with the falses
 

NorEaster18

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TSF might introduce a small delay, but from my testing, it's pretty negligable. It does, however, help tremendously with K band BSM's
 

Redmed

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I thought TSF just introduced a delay.
It can help with really weak transient falses, it can add a small delay on Kband as it may wait to see the signal present long enough before it alerts meaning little tiny weak blips of signal will be ignored. It helps some with falseing, I run TSF on on the R1 and it's a noticeable difference in falses. , when you have a strong source it wont squash the fales though, and of course real signals will still alert well.. now if you font face much real Kband and and your city speed limits are high enough you can also bump up quiet ride to 35-40 and it will silence Kband under that speed... if they run Kband around you and you have lower speed limits then maybe that doesn't work. Around me most of the roads are 35mph, so I have quiet ride at 40 on a redline EX (as they wont bug you for 5 over) that extra few MPH higher limit really really helps around town with the falses
I'm going out now with TSF on. I have Quiet ride at 30 because there are 25mph sections locally that are watched closely. Hopefully TSF will help.
 

Redmed

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Well it's too early to tell, for sure, but after two passes thru three towns the TSF seemed to quiet things down. I just may not have have encountered any BSM's in today's drive. Thou compared to other drives thru the same towns without TSF I've never gone thru town as quietly. I will be surprised, if in other drives that by turning on TSF caused such a improvement with BSM's.
 
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thebravo

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Well it's too early to tell, for sure, but after two passes thru three towns the TSF seemed to quiet things down. I just may not have have encountered any BSM's in today's drive. Thou compared to other drives thru the same towns without TSF I've never gone thru town as quietly. I will be surprised, if in other drives that by turning on TSF caused such a improvement with BSM's.
It makes a big difference on the R1. So I'm glad to hear it seemed to help thus far!
 

sdrawkcaB

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If it's like the R3 it sets K band sensitivity to 15% of max, according to what I read here.
On the R3, city mode is -15dB, which results in 18% of Full / Highway sensitivity according to this great post here:
 

DocH

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I have found that all I have needed so far is to run only with the K filter on ( Highway mode) and My DFR7 is nice and quiet RE falses. I imagine much of the quietness has to do with where I have driven...I can imagine a trip down closer to NYC is going to make it more "chatty"!
For some reason I just don't seem to get alot of "noise", yet it seems to do quite well at real K band.
Driving in Sussex County, NJ it does very well with the Sheriff's Office K band I have run into and its Ka is Excellent!
Even off-axis I have have been very pleased with it!
Once I get a dash cam (Next month's budget!!) and get My skilz improved at including Google maps shots posted, I hope to be able to "show AND tell" here on RDF!!

Doc
 

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