I am lucky in that I have a Whistler H/H Scanner already. Nowhere near the specs of the DV10 in terms of many things I wanted, but has a few that the AOR model does not. I also of course have an AR-DV1, so I will not need to buy another Radio, and can afford to put the refunded money away, and keep it until hopefully I can get a DV10 (MKII) at some time in the future.Thanks for all the testing and posting of these unfortunate problems. I had $1k set aside for a DV10 and was first waiting for some feedback and now I have enough information to buy something else instead.
There is no excuse for releasing a product that does not meet specifications and doesn't completely delight the customer.
You can get a more exact error measurement if you use CW mode or SSB. Use no modulatation, just a carrier and adjust the generators RF frequency to give no beat tone. As the frequency drift away you will hear the beat tone go up in frequency so adjust to no tone again to get the exact frequency drift. You measurement indicate a 6 PPM drift.
The #2 crackling tone concerns me a bit. It's usually a telltale sign of a bad IF filter. It could be broken or perhaps a bad design with a lot of ripple. If you can select another IF filter it would probably not have a crackling tone when the frequency are a few KHz off, or else it might be a bad design or too low quality of the IF filters.
Anyone who has, or is considering buying an AR-DV10 should look at this Facebook Group:-Hello All,
I have asked for assistance on this issue from a distributor and have this to report to the forum as of today from a distributor;
I just sent the following enquiry to AOR in Japan a few minutes ago...
A prospective scanning receiver purchaser is interested in buying an AOR AR-DV10 or Icom IC-R30 from us.
He's asking (and some other customers are also asking similar questions)...
"OK thanks. Can you also update me on the AOR Dv10 issues that are happening with the stability and drift". Thanks,.
Is AOR planning to improve the frequency stability of the AR-DV10 re frequency drift vs. temperature, e.g. such as by fitting a higher specification reference oscillator crystal to AR-DV10s in future?
If anyone else has feedback please post.
1. DMR, along with P25 phase II and NXDN use 6.25 kHz IF Bandwidth, NOT 15 kHz as it states. That in itself is enough to explain why the DV10 is just NOT receiving/decoding many Digital signals other makes of Radio (and AOR's DV1) are managing to find.One of the replies I have on this is as follows;
Here is the reply from our engineer:
The AR-DV10 brochure states +/-5ppm frequency stability. In clear that means that if you are receiving a signal at 450MHz, it might drift by +/- 2250Hz.
At 140MHz it’s approx +/-1000Hz.
After turning on the AR-DV10, internal temperature is rapidly increasing , that would make the frequency drift.
+/-2250Hz is no problem for decoding of digital modes, since the filter bandwidth is 15000Hz.
In comparison, the AR-DV1 is 2.5ppm, AR5001D is 0.1ppm.
What I find interesting is the report of using the adjust menu to change the reference setting. When the reference oscillator setting was changed to bring the DV10 back on frequency, lower frequencies were off. This indicates to me that the problem is not the reference oscillator, but another fixed frequency oscillator further on in the receive chain.