6 metres is up

Today is 26 May 2016. I keep an eye on propagation predictions and current conditions using various websites. One of them is HRDLOG.NET which has current conditions shown in graphical format. This is a small piece of code that can be pasted into your own website to display this if you like, indeed I have it on this blog. Details on the HRDLOG.net website on how to do this.

Look how high the 6m bar is

4 metres is open too but I don't yet have a rig for that band

I noticed 6 metres was showing a lot of activity so I tuned the rig over to it. Lo and behold there were a load of stations both distant and close so I changed the antenna to my 6m vertical.

QSO after QSO followed for a couple of hours in the afternoon. Suddenly out of the VHF doldrums comes decent working.

2 Rigs 2 Antennas 2 Switches - Part 3

6m activity is very sporadic and as we are coming up to the Perseids maximum activity phase (August 12th 2015) then I have had chance to try out the switches in anger (so to speak). I heard a DXPedition station calling CQ on 6m from Aland Island (a rare DXCC island off the coast of Finland). I was on the dipole at the time and decided to switch over to the inverted Vee. Wow what a difference, before he was about RS52 perfectly readable. As soon as I threw both switches over to the Vee then he was coming in at RS57 occasionally peaking at RS59.

The new switching mechanism works a treat and is superb. Maybe my dipole is not that efficient!

I bet behind your computer and rigs it's a rats nest of cables like mine!

2 rigs 2 antennas 2 coaxial switches - Part 2

The Diamond CX-210A switches arrived along with some high spec 0.5m long patches leads terminated either end with PL259 plugs.

I cut a small piece of plywood on the table saw and mounted both switches side by side with the supplied screws. One of the patch leads was connected between the switches as per my circuit diagram outlined in Part 1.

The other two patch leads were used to connect to the two rigs. The antennas were then connected to the switches output as per the photo.

I placed the switch assembly board behind both rigs on the desk. In operation I just exercise a few muscles and get out of the shack chair to throw each switch! No need for it to be in finger tip reach.

The insertion loss for each switch is 0.05dB from DC to 500MHz and I have not noticed any issues with loss of sensitivity of either rig. I just worked a couple of stations in Argentina and Brazil (about 8000 miles away) on 35 watts PSK31 so neither transmission nor reception have been impacted. VHF/UHF on the FM transceiver is ok too with a distant repeater in Birmingham (about 72 miles away) still being workable on 2m.

2 rigs 2 antennas 2 coaxial switches - Part 1

I have a couple of antennas and 2 base station rigs. The FM transceiver is quad band and is attached to a tri band antenna covering 6m/2m/70cm. The HF antenna is connected to a multi band antenna covering 40m to 6m including all the WARC bands. It is supposed to be able to resonate on 80m band too but I've never had any success with this.

With this in mind the 6m portion of the VHF/UHF antenna (Diamond V-2000) is an inverted Vee that is directional - despite "visually appearing" to be part of a vertically polarized antenna system. The VHF and UHF portions of the antenna are omnidirectional vertically polarized. I have the 6m portion pointing eastwards.

At times of 6m activity it would be nice to switch between the conventional HF antenna to the W-2000 on the HF rig to see if there are any differences. It is very inconvenient to reach around the back of each of the rigs to unscrew the antenna plugs and swap them over so I came up with this idea.
Using a pair of Diamond CX-210A 2 way coaxial switches I designed the circuit shown below.

There is no interlocking so there can become an issue where rigs are connected to nothing on occasion. However the good news is that the output of one cannot be connected to the output of another! As this is going to be used just by me I see no problem. I just have to remember to throw both switches at the same time. 

The antenna switches are connected the conventional way (the HF rig feeding the common connection) of the HF switch. The FM transceiver is connected to one of the switched connections of the VHF/UHF switch. In normal operation each rig is connected to its respective antenna. When I want to use the HF rig on the V-2000 I have to throw both switches to their other positions. I would also switch the FM transceiver off as it wouldn't be connected to an antenna at all.

There doesn't appear to be anything relatively cheap on the amateur market that can do this so in the spirit of ham radio I'm doing it myself. The switches and connectors have been ordered - watch this space!

Working SOTA stations

I have one of the rigs on S20 most of the time I'm in the shack listening for local FM contacts. Occasionally I hear operators calling CQ SOTA. I try to always reply to them as they have taken the time to climb up to the top of a high point. It must be really disappointing when nobody replies back to them so I encourage everybody who hears a CQ SOTA to please reply.

I was just speaking with Tom M1EYP stood upon SP15 "The Cloud" near Bosley, Macclesfield. He wanted other operators to also try reponding to him on 6m SSB. I of course am fully equipped for most bands and was able to just pick him out of the noise. He gave me a 59 response he was only 41 to 51.
On 2m FM he was 59 end stop.

I also send eQSL cards out too so they have proof of the 2 way contact should they need it for an activation. Tom was no exception and an eQSL is on its way.

Diamond V-2000 triband vertical review - a replacement for an older Diamond X-50 dual bander

My old Diamond X-50

The new Diamond V-2000 in situ
The 6m inverted V is pointing
east to Europe

Diamond X-50

As mentioned in a previous post my dual band colinear had suddenly gone deaf. When taken down it was found to be a Diamond X-50. I had totally forgotten what make or manufacturer it was. It was still in excellent condition when it was brought down from its home for the last 15 years atop an 8 foot long pole.

I investigated it and found that the PL259 had a slight amount of corrosion despite it being wrapped in self amalgamating tape and in turn being inside the lower pipe of the antenna.

Diamond V-2000 triband vertical antenna

I received the new antenna and assembled it. This one now has two set screws holding the support pipe to the base of the antenna so Diamond have listened to the criticism on internet forums about the the previous 1 set screw fixing. Now it is really strong and gives you confidence.

6m openings

Over the past couple of days there have been interesting openings on 6m in the 50.100 to 50.200 MHz SSB segment of the band. At the present time there are many European continental stations that are workable from my QTH in north west England. When using Google Earth in conjunction with the Ham Radio Deluxe logbook module I can see most of the stations I can hear are on the same geographical heading of around 310 degrees.

4 x 6m stations worked in around 10 minutes
all lying on the same direction

These stations varied in signal strength from 53 to 59 and sounded like they were in the same room. I did hear a couple of local stations in Manchester which were a few miles away but in the noise. I think they may have been using vertically polarized antennae whereas mine is horizontal. Therefore on direct path I would appear many decibels down to them. However the continental stations would be being worked on the skywave and polarization didn't appear to be much of an issue to them.

The 6m band is quite fascinating. Sometimes there appears to be nothing and then it can be loaded with many stations.
Soon after writing this the band went quiet again. All in the space of an hour!
My advice is keep your eye on the DX cluster in whatever area of the world you live in for advanced warnings.