|Item Weight||1.6 ounces|
|Product Dimensions||18 x 0.4 x 1 inches|
|Item model number||FBA_SRJ77CA|
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Diamond (Original) SRJ77CA 144/440 MHz. Dual-Band High Gain Handheld Antenna Rx: 120~900 MHz. (Gain: 440 Mhz. 2.15 dBi, Max Power: 10 Watts, Length: 15") Reverse SMA
- 144/440 MHz. Dual-Band High Gain Handheld Antenna
- Rx: 120~900 MHz. (Gain: 440 Mhz. 2.15 dBi, Max Power: 10 Watts, Length: 15") Reverse SMA
- *** Works with most Baofeng radios ***
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High quality, high gain + receive up to 900 MHz HT antenna. Increase the performance on your handheld or wideband scanner with a Diamond® SRH Series antenna. Reverse SMA female base
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What do these numbers mean? VSWR measures the amount of power that if reflected back from the antenna to the transmitter due to impedance mismatch. VSWR = 1 means that there is no impedance mismatch and that all power is transferred to the antenna. When VSWR reaches 2, about 11% of power is reflected back to the transmitter -- enough for some radios to start reducing output power in order to prevent damage. VSWR of 4, as seen in this antenna at 144 MHz, corresponds to 36% power reflection. This is simply bad and totally unacceptable for a $30+ whip.
The stock 7" antenna on my handheld which I was hoping to upgrade had a VSWR of about 2.0 at 144 MHz.
I will contact the manufacturer with my findings. The antenna will likely be going back to Amazon.
UPDATE: I contacted the Japanese office of Antenna Diamond, and after a week of silence and a second email, received a reply from Hiromi, who transferred me to the US representatives -- Wayne and Denise. They never replied to my email.
Had a Nagoya NA771R (blue logo). It had a small gap between the radio and HT, and after just a couple weeks of use it started to wobble in its base..
Returned and got this, and not only is the rx/tx WAY better than the Nagoya, but it just feels and looks of quality..
UPDATE: This Antenna is AMAZING!! With the previous antenna I thought I was doing great.. The diamond has opened up a WORLD of new repeaters.. I find my self having to delete seldom used repeaters to make room for the new ones that I want to check out!
SWR meter coming soon.. Will update then. 73's
I don't know if it's the best antenna available, but it's definitely the best of the three I've tried (this, the included rubber duck, and the Nagoya NA-701).
For reference, I tested the SWR on a Nissei RS-40 and came up with 1.2:1 @ 144MHz and 1.4:1 @ 446 MHz.
means my 5-watt hand held easily trips an area repeater 25 miles away to provide solid 2-way QSO's
Very, very reasonable price for a quality antenna that delivers what the company specs say. Would buy another
SRJ77CA antenna if the need arises.