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Reviews Categories | Antennas: HF Mobile & Accessories | Diamond CR-8900 Help


Reviews Summary for Diamond CR-8900
Reviews: 14 Average rating: 3.4/5 MSRP: $100
Description: Quad band mobile antenna - 10m, 6m, 2m and 70cms. 1.26m long, 60 watts max for SO239 mount.
Product is in production.
More info: http://
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VR2XMQ Rating: 2/5 Jul 24, 2007 22:48 Send this review to a friend
Not Good  Time owned: 0 to 3 months
Have tested the antenna on 29MHz FM, 51MHz FM, 144 and 430 MHz. Mine was from Diamond from Japan, so instructions were all in Japanese.

After giving it to a Japanese friend to translate, I tuned the 1OM FM as specified, installed the antenna and used an antenna analyzer to test it. Despite trying to tune the end stub for 10M FM the antenna would not resonate anywhere near the 10 FM portion that it is specified to. The only way to even get it near resonance is to use a antenna matcher.

The same poor performance was found with 6 meters and it did not resonate in the 51MHz portion as so specified. The best was a match at 50.200MHz 1ith 1.8:1, to lower the swr again a matcher is needed.

144 and 430Mhz were ok, but performance was not something to jump up anddown about.

If you want to use it for 29MHz and 51MHz FM, there is no chance without an antenna matcher.

Very poor and not up to expectations.

Steve, VR2XMQ
 
M3RLQ Rating: 2/5 Jul 13, 2007 23:20 Send this review to a friend
Diamond CR-8900  Time owned: 0 to 3 months
Like G4IJE I have my CR-8900 magmounted to the roof of my car and find the SWR out of range on 6m.
Works well on 2m (1.1/1.2) although I have no idea whats going on on 70cm as I dont have a SWR meter for that high frequency but then again this antenna is supposed to pre-tuned I read. So only 10m needs tuning ????? Hummmmmm I'm not so sure.

M3RLQ
 
G4IJE Rating: 3/5 Jul 27, 2003 12:35 Send this review to a friend
SWR not good on 6 metres  Time owned: 0 to 3 months
Well I've had a tweak but the adjustment provided only affects 10 metres. I can get a good match around 29.600 MHz (about 1.2:1) but on 6 metres the SWR is still around 2:1 at 51.510 MHz. It doesn't get any better on other frequencies in the band (50-52 MHz). The antenna presents a good SWR on 70 cms (best around 433-434 MHz), so three out of the four bands are as they should be. Shame about 6 metres; not sure what do about it.
 
G4IJE Rating: 4/5 Jul 25, 2003 17:09 Send this review to a friend
Early impressions are good  Time owned: 0 to 3 months
This quad-band mobile from Diamond is apparently designed for use with the Yaesu FT-8900R - hence the model number. I have just compared it with the Diamond DP-TRY2E and it is noticeably better on 2 metres (1-2 dB at a guess) and maybe just a fraction better on 6 metres. This was a suprise as I had assumed that to cover 4 bands the performance on each would be severely compromised. The SWR around 145.500 MHz (the European FM part of the band) is good but it's not so good on 6 metres. At 51.510 MHz (UK FM calling channel) it is about 2:1. However, if I can decode the Japanese instructions that come with the antenna I may be able to improve that a bit, as some adjustment is provided. A 10 metre FM test (at 29.600 MHz) was inconclusive as I don't have an SWR meter for such a low frequency! I haven't had a chance to check out 70 cms performance yet. All my tests were carried out with the antenna plugged into a heavy-duty 7" diameter magmount on the roof of my car.

My initial impressions are that this antenna may well be an ideal companion for the FT-8900R, as long as the SWR on 6 metres can be trimmed down to a reasonable level.
 
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