SPS-141 questions about switches combination

[muamshai]

I tried to find answers to these questions but couldn't find much.

 

 

1. Active/Passive switch (Active like working all the time and passive like works when locked)? is even programmed?
   
2. Program I/II. What is the difference between these two? Are these implemented in game?
   
3. Continous/Pulse. This might be continuous music or on/off music?
   
4. which combination works? and under what circumstances?
   
5. Auto chaff/flare release work? When does it happen (as in how far way the incoming missile is)?
   
6. Last question: How many chaff/flares does SPS-141 carry?
   

[Kang]

That would interesting to know. It's been a while since I've made a few attempts with the SPS-141, but at least a few months ago I concluded that the jammer doesn't seem to work at all in DCS.

[Frederf]

1. Passive is for gathering eletronic intelligence. Active is for emision of jamming signal.

 

2. Program switch appears to be yes/no. In up position program will run, down program will not.

 

3. Continuous/Intermittent choosing jamming signal all the time or strobing on/off. The red light gets stuck on if you leave the program by a switch. To extinguish red light change to intermittent and turn off active or program switch while red light is off.

 

With continuous or intermitten program jamming a Hawk did not fire at the normal range 40-50km (flew overhead). If jamming started after launched at the missiles (including yet to be fired) were not deterred but may have increased the miss distance (fewer hits but I did turn slightly).

 

5. Could not get automatic dispenser. Only manual bursts 2f1c as in the ASO-2A.

 

6. It should carry 64 chaff (zero flare) but it is using the 40/18 c/f split from the editor the same as the ASO-type.

[muamshai]

thanks for answers. The documentation for this is very vague and hence the questions.

[foxbat155]

2. Program switch appears to be yes/no. In up position program will run, down program will not.

In RL SPS-141 have few logics systems, which are used for jamming. Depending on chosen program different set of logics are used

-------------------------Type of enemy radiation-------------------------

------------Pulse-----------Continuous----------------Mixed-------------

--------------------------------or---------------------------------------

--------------------------quasi-continuos--------------------------------

-------------------------------------------------------------------------

Program I : - logic A-----------logic B-----------------logic A-------------

 

Program II: - logic A-----------logic W----------------logic W-------------

 

Logic A: jamming of missiles homming heads, fighter's fire control radars, ground fire control radars from SAM's and AAA systems (false distance and angle signals),

 

Logic B: jamming of missiles homming heads, fighter's fire control radars, ground fire control radars from SAM's and AAA systems (target's false speed signal),

 

Logic W: used for group defence, at least two aircrafts with SPS ( "doppler noise" and "blink noise" simultaneously from both aircrafts flying in formation ).

 

This is basic functionality, because inside pod there is control box with additional switches which can be set before flight ( according recce informations ). This change main jamming modes by additional submodes, generally i think impossible to recreate in DCS due high level of complexivity.

 

Switch "Active/Passive" have wrong description. Literally should be "Reception/Transmitting". First is observation mode, SPS is looking for threats, second is active jamming but not all the time, only after illumination by enemy radar. One important thing: SPS is reacting ONLY for lock-on signals, so she NOT jamming search radars or fire control radars in search mode.

 

"Continuous/Pulse" switch. In RL this is "predicting" function switch. Pilot sets by this switch kind of "expected" type of threats. This involves additional submodes to main logics.

 

ASO-2 should fired chaffs automatically, and is triggered by signals from SPO-10 ( lock-on signal ) if switch is in AUTO position.

[Frederf]

That's is as I expect. Is reception mode for recce to record and evalute after landing or is the gathered information used on the same flight changing the pod behavior?

 

EW is really interesting and can get very complex. For DCS a lock based reaction jamming and auto countermeasures is enough.

[foxbat155]

As far I know, no record device of any kind inside pod. So I think no ability to do reconnaissance task with SPS, all data in reception mode is used in real time without storing.

[Frederf]

OK, so active/passive is not-allowing/allowing jamming emission. The red signal light is detected signal or is signal generated by jamming?

 

Automatic chaff dispense is working by SPO-10 link regardless of active/passive switch?

 

Understood continuous/pulse is switching if expected threat radar is continuous wave or pulse doppler (monopulse?).

 

It would be exciting if SPS performance againt different types would change if cont./pulse switch matched type. E.g. correct type 100% effective, wrong type 50% effective.

[muamshai]

I would really prefer if devs can tell which combinations and functionalities are not working. The documentation doesn't have much info about it.

[foxbat155]

OK, so active/passive is not-allowing/allowing jamming emission. The red signal light is detected signal or is signal generated by jamming?

 

Blinking red light working in reception mode and means that enemy signal painted our aircraft. Continuous red light in transmitting mode means jamming in work, so when reception mode - light blink, when pod is working - continuous light.

 

Automatic chaff dispense is working by SPO-10 link regardless of active/passive switch?

 

Well I'm assume yes, chaff releasing by SPO regardless of pod's switchology ( except of course Manual/Auto chaff mode switch ). Pilot's ECM tactics manual says that chaff releasing is based on SPO signals, from SPO manual we know that "Sirena" have additional circuits for this. In my opinion reason is, that SPS is not able detect and jam in the same time. On main avionics box inside pod, exist switch with description "Intervals". Before flight technician can set time break between jamming sessions, what means that pod is working this way: jamming - listening - jamming - listening.....etc. So in this situation better solution is chaff according SPO because she working continuosly what is important in danger situation.

 

Understood continuous/pulse is switching if expected threat radar is continuous wave or pulse doppler (monopulse?).

 

Yes, according data from previous recce flights.

 

It would be exciting if SPS performance againt different types would change if cont./pulse switch matched type. E.g. correct type 100% effective, wrong type 50% effective.

 

That would be great, additionally taken in account things like signals strength, angle position relative to enemy radar, appropriate implemented chaffs, different jamming technics etc. , maybe some day......