Monday, 30 May 2016

Cold Bank Holiday

So far it has been a very dull and chilly Bank Holiday Monday, so I've been using the time to catch up on some writing. I have two Conference papers to write with both of their deadlines looming in the next week.

In addition to those I have an equipment review to write for Radcom, so what am I doing writing this blog as well?  Good question, but whilst the words were flowing seemed like a good time to put something onto the blog about the new rig.

The new IC7300 has been working out well, with a number of new locators and DXCC worked on both 6 amd 4m since Saturday. I've also been thinking about how to add a sutable transverter interface to the 7300 so that I can use it to access other bands.

The touch screen spectrum display is a pleasure to use. That doesn't mean it's perfect, by any means, but it is a big improvement over some other implementations and I think in ICOM's next SDR transceiver it will be even better.

One of the shortcomings of the touch display is that when you select the signal you want to listen to it brings up a static, magnified, view of the spectrum around the signal. You then need to touch the screen again to select the signal. I find I cannot touch the right spot to tune accurately to the signal without then having to use the tuning knob to tune it in accurately. I am sure that with the power of modern DSP processors it should be possible to do this automatically. Of course you would then probably need a 'defeat' facility in the event you wanted to select a weak signal next to a strong one!
One other observation is that there is no 70MHz band 'button' necessitating a frequency input, which means several button presss to go to, e.g. 70.2 input
You quickly get used to this, but a 4m band button would be nice, please, Mr ICOM
More anon.
Sam


Sunday, 29 May 2016

IC7300

I was able to pick up my new IC7300 at yesterday's Waters and Stanton open day. I have been in two minds about the wisdom of buying one, but Dayton finally decided me. I already have a several rigs, but I had several reasons for going ahead with the 7300. Not least is the desire to develop a suitable interface to an external transverter for 2m and/or 70cm. With all those 7300s out there, just asking for use on higher bands, I just need to do this.  A complement to the Anglian transverter, maybe?

My first impressions of the 7300 on 6m and 4m are very positive. The multiview touch screen is easy to use and a very much easier to use implementation of a spectrum display than the P3 I use with my K3.

On 40m I initially thought I had a problem. It appeared that the receiver was deaf. But it turned out that the receiver was just very quiet. Signals really stand out from the noise when you tune to one.
Selecting signals to listen to is very easy using the touch screen spectrum scope. It's certainly better than winding an encoder knob to bring a marker onto a signal and then pressing the encoder knob to select (in the process pushing the P3 backwards!).

It is also nice to have up to a full 1MHz display. You rarely need more than this as the resolution is likely to be poor on most screens. The display was especially nice on 4m where it was possible to see the many OIRT FM broadcast signals, at once, as they popped up and disappeared.
I have been sold on the future of SDR architecture for both receivers and transmitters for some time. This is one of the best implementations I have seen yet. 
I have already increased my 4m and 6m locator and DXCC scores with the 7300.

More as I get to know the rig better. And maybe something about the rather nice IC31E D Star handheld I won in the raffle at W&S. Thank you W&S and thank you ICOM!

Sam




Sunday, 15 May 2016

A bit more 13cm EME and Upcoming Dayton visit

I set up again today to check out some changes I had made in the shack. I've repaired my MFJ memory keyer and can now run either a keyboard or straight key. I may buy a decent paddle at Dayton. My 'peers' keep telling me I need to use CW more if I want to get my speed back up!
Anyway, whilst testing I noticed that although the moon is currently at apogee and therefore the degradation is high, I could occasionally hear as well as see my own echoes with the 200W PA in the shack and with an unacceptable amount of transmit cable loss. My plan is to move the PA out to the dish. The 27V PSU is already out there in a weatherproof case with 110V AC supply and all ready to go.

Dayton
I am off to Dayton on Thursday and back early the following week. Whilst in Dayton I will be attending the new VHF/UHF weak signal dinner in Miamisburg, Dayton on Friday evening. This new event replaces the excellent event previously run by Tony Emmanuel, WA8RJF, but sadly no longer organised by him.

I will be in the Dayton fleamarket much of the time, on stands 2766-2769 with WA5VJB.
It looks like it will rain (nothing new there, then!) Friday afternoon through Saturday, so I'll need to take the wayerproofs!
I'll report back on Dayton on my return.

Sam



Friday, 13 May 2016

2320MHz EME

Today I replaced the 6cm EME feed with the 13cm feed and hooked up the transverter and PA in the shack.
It is no where as critical to track the small 2.3m dish on the lower band as the beamwidth is so much greater.
Although I didn't see any trace of a JT65C signal from D44TVD I was asked on the HB9Q logger by UA3PTW for a sked. His -15dB signal was easy to find and he gve me -16dB. When we had completed I was called by an enormous signal that turned out to be HB9Q. His -11dB was one of the largest signals I have seen on 13cm EME. He gave me -13dB. IK3COJ then askd for a sked and we swapped -15/-20dB
This has brought me up to a logged 21DXCC on the band with 18 of these on EME. I know I have worked many more terrestrial DXCC than the 3 it looks like but these have not been transferred from my paper logs yet.


Thursday, 12 May 2016

5760 EME

I have set up the 6cm EME system to try with the D44TVD dxpedition. He is trying to be QRV at 14:00Z today.
6cm is not my best band due to low transmit power (25W) but sun noise is good and I can see moon noise. JT Echo mode is showing lots of libration and a very weak return. Degradation is high at present.
I may have to change bands to try with him on another day. His 1m dish will make it difficult on any band when I only have the 2.3m dish at this end. But hey, don't try, don't know if it will work!