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The other day with my friend open RX65 the HORN antennae consist of a cover secured by 4 screws. On the circuit board a potentionmeter for calibration using a miniature screwdriver turning clockwise or anti-clockwise. Pulled into a regular gas station and calibrate according to band ferquency. This is a trial & error maynot be accurate at least my RX65 does not display SERVICE REQUIRED. Still monitoring the sensivity and it does pick-up LASER and X & K band.
this is very interesting. Could you make a picture of the potentiometer from the rx. I have a bel980 that has problems similar to this..
THanks.
That IS pretty interesting, I have always wanted to look at a unit that is displaying self cal so I could look into that...
ha.ha. my rx65 is almost back to normal save the cost of sending back to Bels for calibration. My trial & error paid off. No parts replacement just calibrate simply DIY. My rx65 pick-up signal the same area i was travelling it's as good as before. am not sure the bel980 is sharing the same horn antennae with rx65 just remove the cover there is only a potentionmeter for calibration is quite simple either just pull into the gast station which you are familiar with band X or K .Parked your car about 30 to 40 metres away from the AUTO DOOR of gas station turn on the detector power monitor the signal strength when picking up signal. I judge myself the signal strength should indicate about K1 to K2. you have to remove the horn antennae by pulling out and calibrate accordingly by turning clockwise increasing the signal strength to K4 to K5 for once it low volt display and self14 followed by service required. From here i decided to turn anti-clock wise the signal strrength bring down to about K1 and i knew that calibration may be right. Now the real test is to drive to the familiar places it does pick-up X, K bands and Laser along the way and is almost the identical in signal strength as before. So far yet to encounter KA band will keep posting.
PS: Am very upset Bels & ROY did not reply to my email regarding the calibration issue.
Honestly am not joking those who bought rx65 having selfcal, service required display if i can do it and I beleived if you can do it either am no technical man. my friend told me the frequency drift a little resulting calibration require. similar to a transistor radio tune to the correct frequency but the transmission is slightly distorted. Trust me save your money and simply DIY. Good lucks....
Please email me i will photo the horn antennae and potentionmeter for easy reference.
1. To remove 2 screws from the back cover (1) screw is concealed by the serial no sticker so need to peel off.
2. Thereafter pull out the LED display cover by using your delicate fingers
3. Remove the 3 screws that secure the horn antennae then pull outwards . Then take the horn antennae back cover by removing 4 screws.
4. There is only one pontentionmeter for calibration using a small miniature screwdriver for calibration.
my email is derence.lye@tlmotor.com.sg
perhaps someone should sticky this, just a suggestion.
Here's a question for those "in the know." If this repair is done for a particular k-band source is it more or less granted that Ka performance will be optimal as well?
If the RD uses a single LO, then the answer would be "yes". It's not a precise calibration but it's better than having it out of spec to the point where the RD doesn't work.Quote:
Originally Posted by brick
Doesn't BEL use different LOs for each band?Quote:
Originally Posted by kpatz
GTO_04
They don't use differnet LO's for each band. However, there is 3 LO's in the unit. Unlike many other detectors that only sweep the first LO, in the Belscorts sweep both the first and second LOs. Not sure about the third...
Jim
Is this the "fundamental mixer technology" which they used to describe in their ads?Quote:
Originally Posted by jimbonzzz
I just assumed that there was a LO for X, a LO for K and a LO for Ka band, which might be different configuration since it was sweeping a wider range of frequencies.
GTO_04
Hard to say what they meant by that...could have been a lot of different things. Mostly marketing jargon I would guess :lol:Quote:
Originally Posted by GTO_04
In that case, would there be 3 things to "adjust" with the screwdriver?Quote:
Originally Posted by jimbonzzz
How about adding some pictures to this thread showing what you are adjusting :?:
Pictures are worth a 1000 words!
if Roy Zegars is watching please comment Roy as you are in the know.
Cheers
S
Just a suggestion guys.......... Radar Detectors are sensative instruments..........if you are going to be twisting on any pots inside there with the casing off I suggest you DO NOT use a metal screwdriver..........use a plastic precision screwdriver. A metal one will have a negative effect on the tuning and there is much more risk of static hits, especially if you are messing around with it in your car.
Just to let you ppl know I had indeed succeeded in getting my RX65 back to working condition now picking-up KA frequency and all other bands with acceptable results. Lots of patience, times, trial and error
adjustment resulting a fruitful results.