NEW STOCK ARRIVED . Quad Band - Ideal for Yaesu and TYT/Retevis quad Band Mobiles
The 3 radials at the base are aluminium, with the usual screw in construction, and being marine based, have an SO239 antenna connector on the bottom. The assembly is fitted with a recessed hex grub screw and the aluminium mounting tube and two good quality mast clamps are supplied.
Price wise - you get marine quality construction on the amateur band for a similar price as the hobby quality X-30 Series - plus the advantage of being able to be opened up and modified if you want to. Trimming the lengths internally requires a large soldering iron - that is it!
For information (and perhaps useful for scanner enthusiasts) the antennas has these resonance frequencies
28.0000MHz
49.2000MHz
94.0000MHz
145.000MHz
260.800MHz
435.900MHz
This suggests the basic design is similar to the dual band version, but with tweaks to get adequate performance at 10 and 6m. If you look at the depth of the resonance traces - they match quite well the claimed gain measurements. Most gain is at UHF, and the longer wavelengths have less due to the physically short length. Down at 27/28MHz, they are useful as they are small, but to get good performance down there, they are too short - like a helical antenna on a hand-held. They match, but don't have stunning performance. The one on my office mast actually spends most time on marine band. The sharp resonance at 94MHz is a bit odd - quite narrow, but a happy accident!
Price included delivery via Parcelforce 48 - the only carrier happy with long thin parcels at the moment!
If you live in the Channel Islands - please contact me before ordering as new rules make shipping these parcels to any of the islands crazily expensive - as in £68!
The factory supplied specification is:
Model: Q-30 -2.5/2.5/3/5.5-28/50.5/145/435V
ELECTRICAL SPECIFICATIONS
Frequency Range----------------------- 28/50.5/145/435MHz
Impedance-------------------------------- 50 Ohm
VSWR--------------------------------------- <1.5 (145/435MHz)
<2 (28/50.5MHz)
Gain----------------------------------------- 2.5/2.5/3/5.5 dBi
Polarization------------------------------- Vertical
Radiation---------------------------------- Omni
Max. Power Input-watts---------------- 60 W
Lighting Protection---------------------- Direct Ground
MECHANICAL SPECIFICATIONS
Height--------------------------------------- 1220 mm
Radiating Material----------------------- Cu
Radome Material------------------------ Fiberglass
Color---------------------------------------- White
Material of Hardware-supplied------ Aluminum Alloy
Cable Termination----------------------- SO239
I thought I'd add a small note to answer some of the questions received.
These are designed to survive in 60mph winds, and the shipping weight is approaching 2Kg. They come with mounting brackets to attach to poles with dimensions up to 2" (50mm), although 37mm is probably the thinnest suitable. The photo is of one attached to my office - they are not too tall, but quite wide! They are 1.3m length and the radials require a space of 85cm around the vertical radiator. They DO NOT attach directly to a radio. They won't fit through a letter box, and they are not 'bendy'. They do give a good match on CB radios. Oddly, they do have a reasonable performance on PMR446 frequencies where the VSWR is just under 2:1. They are not really suitable for mounting on a car roof rack. The shroud is very stiff - not bendy at all. Power rating - I've tested them on 50W VHF and have no issues to report, but the specification sets a maximum of 60W - due to the limitation on the matching components.