Tag: icom 7100

QRO portable from Cromer North Norfolk

I have always enjoyed operating portable HF as you can put up antenna and work bands not possible at home. This coupled with finding an RF quiet location can make HF portable very enjoyable.

Using a 12m spider beam roach pole, an 80m doublet fed with 300 Ohm ribbon cable and Icom 7100 I parked in a rural country lane surrounded by fields. The doublet was cable tied to the roach pole at around 11m, and the pole secured to a farmers fence.

 

 

The Icom, Expert 1.3KFA linear and ATU was placed in the boot of the car, and power was provided by an EU20 Honda generator. I started operating at 19:26 with the first call in the log G4JXC Bob from Bristol, signals seemed very good with reports usually over s9, sometimes s9+40.

At times I had a pile-up, really hard to pick out any calls, I did try and pull out a few QRP stations some running just 3 and 4w.

The amplifier definitely helped, but getting a large antenna in the air inverted V means a lot of the RF goes up in the air. Over the next couple of hours, I worked 57 stations in 10 countries. As darkness descended the skip did lengthen out a little, with stations calling me from Sweden, Germany, Spain and the Netherlands.

 

I was also able to monitor my own signal on my KiwiSDR located some 100 miles away. It was fun to work some stations that had also used my SDR, and also catch up with some people on twitter.

 

A enjoyable was to spend an evening, thanks to everyone who called.

 

Icom 7100 VHF/UHF changed to N-Type socket

Icom 7100 rear sockets original configuration

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Icom 7100 have 2 antenna sockets,

Ant 1 –  HF, 50 and 70 MHz,

Ant 2 –  144 and 430 MHz

 

John M0UKD made this change and wrote about his experience.

You can download a copy of the Icom 7100 user manual here.

The most difficult part is finding a source for the 2 hole N-Type sockets, I sourced one from Ebay.

Here you can see the chassis socket has been changed to N-Type.

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I have included a picture showing the internal layout with the rear panel removed

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Practical Wireless 70 MHz contest

The popular shortwave and ham magazine Practical Wireless runs a 70 MHz contest once a year. The contest attracts a number of entries from all around the country, including one keen team who climb Helvelyn in the Lake District (M0BKQ/P). The entry from M0TAZ/P didn’t include a 900m accent to the top of a mountain, we operated from the JO01 Kelvedon Hatch Secret Nuclear Bunker near Ongar Essex. The location is over 100m ASL and affords nice views over the Essex countryside.

The Setup21159214803_346a15ad19_k

Power Honda 2KW gas powered generator

Transceiver Icom 7100

Mast Racal 12m PU12

Antenna M0UKD homebrew 4E

Linear amp M0UKD 160w homebrew

 

The activity started at 1PM and finished at 5, activity levels were moderate with the first 2 Hrs being the most active. Many portable stations operate 10w or less so the amplifier and 160w did mean we sometime had to listen very hard to get a calling stations details. Sometimes people assume that because they can hear you loud and clear their signal must also be good.

21764052605_373d546013_kThe weather was sunnyScreen Shot 2015-09-28 at 11.10.34, and this must have helped encourage people to operate portable outdoors.

We managed to work 47 stations our best DX being Scotland GM4JR at 454 km and was pleased to work into Wales GC0VPR/P, GW0EIY/P and GW4EVX/P and also the Netherlands PA4VHF.

 

The QSO map pins indicates the location and number of stations worked.

Many thanks to John M0UKD for the use of his beam and 70 MHz amplifier, both worked flawlessly and George M1GEO, Dave M0YOL and Chris G8OCV for assistance with the mast and words of encouragement.

Thanks to everyone who called, and hope to work you again soon 73 Dave M0TAZ

 

Further pictures are available online.

Second 70 MHz contest

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We had some great September weather today for the RSGB 2nd 70MHz contest. We setup a station at the Kelvedon Hatch ‘Secret Nuclear Bunker’ as seen above, using John M0UKD 70MHz amplifier and his 4 element DK7ZB 12.5Ω Yagi. The mast was my 12m Racal PU12 a push up 12m mast, and the location was around 100m ASL. The radio was the Icom 7100, as this provides all mode 70 MHz coverage.

                                        QSO map

QSO Map - 2nd 70MHz RSGB Contest

Conditions seemed quite flat, we didn’t manage to work into Scotland or Ireland but our best DX (as many others) was PA4VHF at 449km. Other highlights were GJ3YHU in Jersey and M1CJN/P in the North York Moors.

A very enjoyable day of operating and testing the new amplifier. Next week, it’s the Practical Wireless 70MHz contest, so lets hope for the same weather and some band openings perhaps? Maybe I’m asking too much

The Claimed Scores are available. Thanks to John M0UKD, George M1GEO, Dave M0YOL and Chris G8OCV for help & company!

70 MHz portable from Cromer

Operating portable from the highest point in Norfolk (100m ASL) from Beacon Hill close to Cromer North Norfolk JO02OV. The set-up included the Icom 7100 and 50w into a Slim Jim supported on a 12m Spider beam roach pole.

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Beacon Hill is an old Roman Fort, and while its elevated you cant really see much due to the surrounding trees. I was able to make contact with a few local station. M6CFU – Steve @ Overstrand, G4OUB/M John, M6GAD – Gary Cromer, M0AQC – Alan Mablethorpe.

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Dave M0TAZ

 

© 2015 Dave, M0TAZ