| Author |
Message |
    
Jimmy396
| | Posted on Monday, January 27, 2003 - 12:06 am: | 
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I want to know does it drift like all the other export radios on SSB .I had a Pluto years ago and forget a bout it talk about drifting.And is it a just like the Cobra 148DX.I like the way it looks and always wanted the 148DX.Hope i get good news from you members .Thanks Jimmy |
Tech671
| | Posted on Monday, January 27, 2003 - 5:45 am: |
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Not as bad as the 3600 board but it does still move with temp. It's no big deal, you have a coarse clarifier. |
Dinker1
| | Posted on Monday, January 27, 2003 - 1:52 pm: |
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i have good luck with mine- love it! DEAN_ |
Jimmy396
| | Posted on Monday, January 27, 2003 - 5:03 pm: |
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If its like the 148DX than why do they make these radios so thay drift.You think with the market with DX radio's they would get it right if your spending the money.Also please need some more feed back on these radio's from there owners.About trans on SSB i like DX'ing how about it guys .SOME FEEDBACK PLEASE JIMMY |
Mack
| | Posted on Tuesday, January 28, 2003 - 10:04 pm: |
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talk about a piece of junk i traded mine for a 2950dx great radio excellent ssb the connex for starters was'nt on frequency when it came out of the box had it aligned and drifted off again am was good but the ssb don't waste your time on it. |
CM 3885
| | Posted on Friday, January 31, 2003 - 1:13 am: |
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I used to have one too and for SSB it is tottaly worthless but AM..... WOW!!!! |
ChillyDog
| | Posted on Monday, February 03, 2003 - 11:11 am: |
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When living in So. California and Mississippi I worked on a number of mobile radio designs without really realizing the significance of temperature related drift.
For the last seven years I've lived in the "frozen tundra." Man! When throughout the year the temperature can fluctuate from 90 degrees F down to -20, mobile radio stability is a much more significant issue!
In my experience, the 3600 board is the most temperature sensitive piece of (hardware) I've ever seen. Most other CB/Export mobile radios are not much better! This includes Galaxy, Superstar, Connex, Mirage, Uniden, Voyage ...
I have, however, been very impressed by the RCI 29XX product. There is no question in my mind that the temperature related frequency stability of this design is above and beyond any other unit I've seen.
My neighbor and I recently performed an experiment. We had three radios in a vehicle: a Connex 4800, a Galaxy 88, and a RCI 2950DX. All radios had been bench tuned to transmit within 20Hz of each other. All were powered by parallel fused lines directly connected to the battery. All fed the same Wilson 1000 hard mounted antenna with a SWR of 1.1 at test frequency, routed via 15 feet of coax through an antenna switch, with 3 foot jumpers between the radio and switch. We let the radios sit in the truck overnight, in order to stabilize temperature which reached a low of 7 degrees F.
At 9 AM, we started the truck and turned on all three radios. After 10 minutes, using a HP5314 frequency meter (indoors on my test bench) fed by a direct coax line to a home-made 1/4 wave vertical dipole antenna, we documented the transmission frequency of each radio. The radios were set to CB channel 20, and each was keyed up in AM mode with no modulation and mike gain set to minimum. Before each measurement, the dead key was held for 30 seconds to allow for stabilization.
The Galaxy and the Connex were both around 1200Hz low initially. The RCI was about 80Hz low. After another 10 minutes, the RCI was within 10Hz of it's bench setting. The Galaxy and Connex were still 1KHz low.
Giving another 10 minutes of warmup, the RCI was stable at 10Hz low. The Galaxy was 850Hz low, and the Connex was still 1KHz off. In other words, after half an hour warmup both the Galaxy and the Connex were in left field while the RCI was well within usable parameters. At this point, we turned on the truck heater, and allowed for a 10 minute period.
The RCI was right on bench settings. The Galaxy read 100Hz low, and the Connex was about 170Hz low. We did one more 10 minute period. At this point, the RCI again was right on. The Galaxy was 10Hz high, and the Connex was 120Hz high!
There is no question in my mind that the RCI is superior in temperature stability under extreme cold conditions. Although the Connex was slightly worse than the Galaxy, both performed exceedingly poorly compared to the RCI under low temperature conditions.
Maybe during the summer we'll try testing high temp performance ...
Best Regards,
Bob |
Orion
| | Posted on Friday, May 16, 2003 - 10:32 am: |
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Bob "ChillyDog". Beautiful review and data. Thanks on behalf of all even though I just read it now and your post is months old. Looking forward to summer test results that you alluded to. |
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