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Post a comment. Thursday, 9 July Avair AV review. To be quite honest it was never really good and now its adjustment potentiometer was shot. I opted for the Avair AV as it covered frequencies from 1.
I opened it and the cardboard cover for it was a little battered but the meter was inside a large padded bubble wrap sleeve and was fully protected. Front panel The instrument itself comprises a large metal box, solidly built and is dominated by a large multipurpose meter. There are 4 rubber feet on the bottom, it is finished in black with silk screen printed lettering. The instrument weighs grams and measures mm wide x 50mm high x mm deep so should fit in a convenient location in the shack.
The RF and power connections are all on the rear panel so make allowances for these connectors. The meter comes with a short un-terminated power lead to female socket. There is also a double sided sheet of instructions translated from Japanese into Engrish.
Installation To install the AV you simply connect a short length of PL terminated 50 ohm coaxial cable to the connector marked "TX", connect that to your rig and connect your 50 ohm antenna cable to the cable marked "ANT". You can connect the power lead to your shack power supply and plug it into the meter. The power is only necessary to illuminate the meter and power the relevant sensor LED. It isn't necessary for operation of the meter.
The instructions say "the meter can be left in circuit permanently for continuously monitoring of the station conditions". The other end I connected to the tri-band antenna that I had just purchased while it was still on the ground. SWR measurements. I set my rig for the lowest power which is around 5 watts on 2 metres.
Then I had a listen on an empty channel to make sure I was not interfering with any body. Then unkeyed the transmitter. You can then read off the SWR reading directly from the meter. In my case it barely moved the needed off the stop. On the frequency I was transmitting on the SWR at 5 watts was less that 1. I repeated the procedure with the transmitter on a 70cm frequency. I also repeated the procedure on higher power outputs setting the switches accordingly.
The end results on 2m and 70cm for my Diamond V, when mounted at 12 feet from the ground, were around 1. I was able to adjust the counterpoise radial to register an SWR of at I made sure that it wasn't a fluke by adjusting the length of the adjustable section counterpoise to 29" at the same frequency and the SWR measurement went up to 1. When I reduced the length back to 23" the SWR went back to 1.
When keying on FM for instance when out of circuit the meter goes up quickly and goes down quickly when you stop transmitting. When the PEP is engaged the meter goes up slower and there is a very noticeable delay when you stop transmitting before the needle goes back down. Specification The following details have been lifted from the instructions that came with the meter. Frequency Range - 1. Also when transmitting at W on the UHF range they recommend 25 seconds on and 35 seconds off.
Again continuous transmission at W will result in burning the sensor. Minimum power input - 0. I have no way of laboratory measuring the meter but for ham radio purposes it probably is adequate. No comments:. Newer Post Older Post Home. Subscribe to: Post Comments Atom.
Avair AV 601 HF VHF UHF SWR POWER METER
Post a comment. Thursday, 9 July Avair AV review. To be quite honest it was never really good and now its adjustment potentiometer was shot. I opted for the Avair AV as it covered frequencies from 1. I opened it and the cardboard cover for it was a little battered but the meter was inside a large padded bubble wrap sleeve and was fully protected.
Avair AV-601 - VSWR Power Meter
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