ICOM AH-5000 antenna

This antenna has just come to my attention. Like all things ICOM it is expensive. It is meant to cover all HF bands (maybe with a tuner on some frequencies). I have no idea how it performs. 

It looks like a Rybakov style antenna, but I have no idea. 

There are other, similar commercial antennas around which are far less expensive. 

Of course, you can roll your own and save a packet!

See http://g0kya.blogspot.com/2009/02/rybakov-vertical.html .

See https://amphenolprocom.com/media/pdfdocs/hf-5000.en-GB.pdf?timestamp=1660739714.

Rybakov HF verticals

These are end-fed antennas for HF usually. Commercial versions are available. 

Some years ago I bought one from SRC in Wales. Although I believe this is no longer available, they all have one thing in common: the end of the antenna is a high impedance, so a transformer is needed to get the SWR into the range of auto ATUs found on modern rigs. Usually this is an UNUN built into the antenna.

In getting things together for my free PDF book, I realised this was absent from my website! This is now corrected. As mine had been unused in the back of the garage, I swapped mine for an active RX antenna that works well. The swap was with Jason M0NYW. 

See https://sites.google.com/view/g3xbm4/home/antennas/x80_1 .

Rybakov Antennas

At the end of a long wire, the impedance is usual high. With a 49:1 transformer, the SWR is usually well within range of auto-tuners found in most modern rigs. This usually means that a multi-band antenna can be erected covering most or all HF bands. In many cases, the SWR is sufficiently low that no tuner is needed at all.

For those unable or simply preferring not to make one, commercial antennas or baluns are available. One that was available was the X80. I bought mine many years ago. It worked well, but was only up for a few weeks as most of my operating was on a single band - 10m. I swapped mine for an active RX antenna. 

I think modern versions can come in fibre glass, but are more expensive.

If you are happy to make your own, all that is needed is the balun in a suitable waterproof enclosure with connectors and a long wire. I think the wire is ideally not a multiple of half waves. There are several designs on the internet I believe. If you are happy to experiment, you can try different wire lengths. The X80, and its successors, looks like a CB vertical. Often people put things inside aluminium ones to make them bend less in high winds. I never did this.

See https://sites.google.com/view/g3xbm4/home/antennas/x80 .    

x80 Rybakov vertical

I bought this about 10 years ago, but apart from a few weeks it was not used and is in perfect condition. 

For those unfamiliar with Rybakovs, these are multi-band antennas that are end fed via a balun. In most cases the auto-ATU in modern rigs can easily match the antenna on most bands. In many cases the SWR is low even without an ATU. They make useful multiband antennas. I believe there are more recent versions available. 

On HF I am almost exclusively on 10m, so this was wasted, so I have recently swapped it for an active RX loop.

See https://sites.google.com/view/g3xbm4/home/antennas/x80 .

A Rybakov antenna on the bench?

In the garage I have a virtually unused SRC X80 end-fed vertical antenna. This was very briefly erected in about 2011 and has remained unused for years. I took it down as reports said it blew around in high winds and at the time my interest was mainly on 10m for which I had a suitable antenna at that time.

The X80 is a sort of Rybakov antenna. These are end fed antennas fed via a unun transformer so the very high end impedance is transformed into a VSWR less than 3:1 that can usually be matched via the auto-ATUs in most modern HF rigs.

As an experiment, I tried loading up the coax to my 2m big-wheel via this Rybakov transformer. I can get quite a good match on a couple of HF bands (at least) but on some bands the VWSR was so bad that the rig just turned off!

By ear, I think my small indoor magnetic loop is as good!

HF antennas

Some years ago I bought an x80 vertical antenna. These are basically Rybakov vertical antennas. I erected mine briefly at the old QTH, but have not done so here. I would need help with erection, whereas my end-fed I managed to string to a nearby tree on my own. The end-fed is a good match on 10m (my favourite HF band) , where it seems to do quite reasonably on FT8.  So, for now, the x80 is unused.

At the time (2011) the x80 had mixed reviews. Some said the aluminium flexed too much and broke. Being a vertical, it is probably noisier than a horizontal antenna. If you have an auto ATU it is quite an easy way to get on several HF bands. These days I think there are stronger versions around.

See https://sites.google.com/site/g3xbmqrp3/antennas/x80

Rybakov antennas

The basic idea of Rybakov antennas is to feed these at the high impedance end via a transformer so the impedance is brought down to the range (usually VSWR better than 3:1) that can be matched with the auto ATUs in many modern HF rigs.

Somewhere in the garage I have an x80 antenna which was a commercial version. I think this antenna is no longer available, but I guess similar antennas are available. The one I have was criticised for blowing wildly in winds. If I can erect it on our bungalow, it should give me access to several bands.

If you buy the toroid formers and wind the transformers, Rybakovs are quite easy to make. There are several examples on YouTube and elsewhere on the internet.

X80 vertical antenna

In the garage I have an SRC X80 multi-band HF vertical. I used this briefly (before my stroke) at the old QTH. It blows around in the wind, but worked quite well as I remember. With my LDG QRP ATU it might serve me well next winter on WSPR on several HF bands.

Verticals tend to be noisier than horizontal antennas. This is a Rybakov antenna fed via a transformer so they can be matched with an ATU more easily. If erected it would replace my horizontal antenna that only covers 3 HF bands.

This is now on my main website at www.g3xbm.co.uk . This was a "cut and paste" job ànd needs attention on the other PC in the morning as I see some words are not visible.

See reviews at https://www.eham.net/reviews/detail/8727?page=1

SRC X80 antenna has arrived

Well, I'm very impressed with how quickly Snowdonia Radio Company despatched my X80 multi-band Rybakov HF vertical: it arrived on my doorstep early this morning only a few days after ordering it. I shall not be able to erect it until next week though as my little grandson is staying with us until Monday. All being well, I'll erect it on Tuesday.

Useful multi-band HF vertical

The Snowdonia Radio Company is offering the SRC X80, a 5.8m long multi-band HF vertical matched via a 9:1 unun matching box. This sells for just £47, which is excellent value compared with similar offerings from the Japanese manufacturers. Such Rybakov antennas offer a decent match, easily brought to 1:1 VSWR using an auto ATU, on the higher HF bands. On the higher bands performance is quite acceptable considering the compromise in size. In the latest edition of PW Magazine G6MXL reports working plenty of DX with 50-100W using one.

Rybakov Wideband Vertical Antenna

For those looking for a simple vertical antenna that can cover a wide range of HF bands you might want to try the Rybakov antenna. This is what IV3SBE says about it:

"Multiband NO TRAP NO GAP Antenna. This Antenna is a small wonder, easy to build and allow you to work all HF spectrum with your TRX and it's internal ATU. It consist of a matching device at it's feed point to enable lowering the impedance of a randow wire. Winding 14-18 turns of twin insulated wire 1.75mm over an AMIDON T-200-2 RED Toroid type and wiring as the image on your right will enable you to perfectly feed the radiating element . Once finished, place it in a waterproof plastic casing used for electrical wiring suitable for UV radiations. Complete it utilizing a SO 239 socket and two Stainless Steel Bolt to ensure long life under external condition. Connect, to the Wire Terminal, a lenght of wire ranging from 7,6m onwards depending the frequency range we would like to obtain. With 7,6m we can easily cover from 7Mhz upwards, for better performance we suggest to leghten the wire up to 8,6 > 12m so to have a better performance staring from 3.5 Mhz. The Antenna will perform well in vertical position utilizing a retractable fiberglass pole ( we use a 9m fiberglass fishing rod ) so to deploy the Antenna in seconds just hook the wire to the top part and extend the elements fully. You are now ready to operate ALL BAND NO GAP making use also of the internal ATU of your TRX for portion of band where SWR is above 2:1. See Below the Antenna fully extended and in Action during a short Portable Expedition."

See http://www.iv3sbe.webfundis.net/html/Rybakov806.htm