Interlace flicker on Hantarex 25 Polo monitor

[RobMcRaf]

Hi folks, maybe one of you knows an answer to this:  I got a MK2 with Polo 25" monitor and re-capped it (The Real Bob Roberts).  The colors, geometry, etc... are just wonderful.  Really nice picture.  So nice, in fact, that I decided to move my MAME/ArcadeVGA stuff out of another UMK3 cab and put it in the restored MK2.  I am using the AGP arcadevga, jpac, groovymame .144, and a p4 2.8.  My concern/question is this: when an interlaced resolution gets selected, the monitor gets terribly shaky (I know that it isnt going to be perfect, but it is much worse than the WG monitor in the other UMK3 cab I was using before).  I can tweak it with the V.FREQ, but it is so touchy that it seems that I have to hold my finger on the pot.  It reminds me of trying to tune in TV stations using "rabbit ears" and just the act of touching the antenna made things change.  If I go to one extreme of V.FREQ, it will get clear just at the point of starting a slow roll; if I take the pot to the other side, it clears up right on the edge of the monitor going crazy.  And, of course, if I get it to stay stable, when I quit back to the FE (mamewah @ 512x288), it is all screwed up.  Are there any components that would be helpful in changing out?  Is this just a normal problem with Hantarex monitors?  Thanks!!!!

[RobMcRaf]

When I say "shakey", I mean that the interlace lines are more than the normal 1/2 line interval so that the letters get sort of scrambled up.

[mecha187]

nobody replied to you, but I can say when I was working on my 2 Polos last week and was using a Tekken Tag board (with broken inputs, and it was stuck on Interlace mode) that the screen wobbled pretty violently. so, they apparently do not like interlacing at all. not very helpful, but wanted to just reaffirm that's what they do. :/

[RobMcRaf]

Thanks for that reply.  I suspected as much, but I couldn't find any info on it.  Thanks!

[SailorSat]

Nah, I've hat several Polos.
They don't have problems with interlace.

HOWEVER one particlular polo has (for whatever reason) the interlaced lines "switched".
So you see Line 2, then Line 1, Line 4, Line 3 and so on.

Never found out whats the cause. I don't use interlace on that one anyways.

[MTPPC]

My Polo looks terrible with interlace, too.