Poor Mans Antenna Analyser

The poor mans antenna analyser was brought to my attention by Dave M0GGK. i had been looking for something like this for a long time.

It was designed by Andre, GM3VLB and his article is really interesting reading. He gives full details of how you can build one yourself. I have one built and am in the process of calibrating the meter.

I decided to buy one ready built from Andre and he still has a few more available but he says when they are gone, they are gone :-) he got the beautiful 50ua meters at a good price but there are no more available from that source.

I ordered one from him and it arrived a few days later, i must say it is beautifully made and is a great asset in my shack. Now i don’t have to rely on guess work anymore when building and setting up a new antenna.

check out Andre’s website http://www.gm3vlb.com/general/poor_mans_antenna_analyser.htm

HB-1a 3 band QRP rig

The HB-1a is a small 3 band QRP CW rig made in China. It was produced as a kit but today the HB-1A is offered as a complete product (batteries not included) using professional assembly with Surface Mounted Technology. The cost seems to be in line with most other rigs offering similar features, power output, multi-bands and of course, size. The current pricing including freight direct from the manufacturer represents a bargain when compared to other units offering similar features.

The digital display offers power output, RIT, storage frequencies as well as short-wave radio receiver functions.

This is an ideal transceiver for the CW enthusiast who likes to set up a station at impromptu locations. A picnic bench in a park with the antenna wire thrown in to the closest tree, a remote camp-site, long nature walks are just a few thoughts. The unit does not include an internal antenna tuner.

The current drain is of a low-power design and allows approximately 50-75 mA on receive. The manufacturer rates the unit, using 2200 mA rechargeable cells at 2 watts output power at 15-20 hours with receive and send ratio of 2:1.

I had to replace the 100 ohm trim pot in the driver stage on this one as it was broken. I set the output to 4 watts on 40m and it was also 4 watts on 30m, on 20m it was about 31/2 watts. The pa transistor is heat sinked against the case but it was standing in free air on this one so i fixed that, used a mica washer and plenty of heatsink paste.

Output seems fairly steady and got clean reports, my power meter is not very accurate so i think i’ll make new one!

Paper clip paddle!

I could not resist making one of these, i first saw one somwhere on the internet and thought thats a good idea, but never got round to making one. Then the latest SPRAT arrived and there was one in there so out came the soldering iron and a few paper clips and one was made. I must say that for what it is it works really well, better than i thought it would. I will be using one for portable operating from now on, weighs hardly anything.

Home made Miracle/ wonder whip antenna

I have read about the Miracle whip and wonder whip antennas and decided to take a closer look at them. I remember reading an article about the Miracle whip in Radcom, it turned out it was June 2006.

I found M1IOS website with his take on the antenna and it was his article i had read. http://myweb.tiscali.co.uk/m1ios/html/wonder%20whip.htm

So i decided to make one and give it a try, i used a ferrite torroid that i had handy but it is not the correct type which should be an FT140-43 or one of the ones bought from the RSGB. With the one i used i don’t get the full coverage of the one M1IOS made but mine does cover 30meters to 2 mtrs.I got the telescopic from Maplin and also the 12 way switches, the torroid is a bit fiddly and takes a while to wind but it is worth it.I set up in Moses Gate Country Park, which is in the Bolton area of Lancashire in the North West of England.I attached the miracle whip to the back of the SWR/Power meter and used a short patch lead to connect to the FT817.First i tried the M/whip on tx on the bands and found it was a goo match on 30 - 2 meters :-)So i then set it back on 30mtrs and tuned around, in the country park it is away from buildings etc so the noise was niceand low, not showing at all on the S meter.I listened around but the few QSO's i could hear were not about to end so i moved up to20 meters, 1:1 SWR no problem, some good strong signals heard and i then had a 2 way qrp qso with Thomas, DL1DRA/QRP/Pwho was running 5 watts from an FT817 :-) 559 both ways. I then got a QRZ from a UA3 station and then i changed bands to 17m.I worked SP6PZG in Poland and he gave me 559,Then i worked DL6FAX and got 569.Next i moved to 15 meters SWR 1:1 but no signals on there so moved to 12m again 1:1 swr but no signals so i then moved to 10m again swr 1:1 but there was strong signals across 10 meters and i worked EA5BS and then SM4DDE who gave me 579 and asked for details of the antenna so i described it as a 1.3meter telescopic whip with a switched loading coil wound on a torroid, he said it was doing really great :-). Next i changed to 6 meters and that also had some signals on it and SWR was about 1.7:1 and i worked EA1FF and he gave me 599 very strong signals both ways. So it was a very pleasant and enjoyable couple of hours and i am more than pleased with the results of using the homemade miracle whip :-)

28/JUNE/2010

I took the FT817 with me and the home made miracle whip antenna when i went for a walk before meeting Charlotte from school.

I walked in the open heathland which is set aside by Salford council to walk on and i found a spot where some rocks were and a nice small flat topped one was used to set up the rig and antenna. I tested the antenna on 20-6mtrs and found i could get a low swr on them all. Nothing much on the bands as they were not good but i heard a strong signal on 20m and called him. F6ENI he came straight back to me and we had a chat for about 10 minutes, he was 599 and gave me a 569 but during the several overs he said my signal was peaking S9 at times. not bad for 2 watts and a small whip antenna.

Royal Signals Amateur Radio Society- May test

I have been taking part in the annual anniversary test which runs for the whole of May each year.  The object is to work as many members of the society as you can. This year has been hard again with poor conditions. I don’t think i did so well but have managed to work 31 members, mostly in the UK but one in Spain and one in Australia so i was especially pleased with VK6PG on 20 meters.

Antennas have been my indoor magloops and on one occasion a 132ft doublet i strung out at the club one weds night.

The VK6PG though was worked on my indoor “Baby Zilla” magloop

Seen here on the right. It is mounted N/S in my roofspace and is giving a good account of itself. VK6PG said i was as strong as most of the UK stations he had worked and said that condx were poor so that made the QSO with Alan even more pleasing. The rig used was the FT840 and i was running 50 watts.

Portable with FT817ND

I like portable operating and so when i get the chance i will take to the hills :-)

Here is a short video of the FT817ND set up in a portable location and using the small PAC-12 antenna. This antenna is great for backpacking as it splits down to just 12 inches but is almost 9 feet high when assembled. Mine is for 40 / 20 meters but it can be made to operate 80-10mtrs with the appropriate loading coils.

 

New half wave end fed wire tuner for FT817nd

Here is a photo of my new half wave end fed wire tuner, i made it for use with my FT817nd, it will fit direct onto the SO239 socket on the rear of the rig. It will tune a half wave end fed wire on 40,30,20,17,15 and 12 meters. It has a built in LED SWR bridge, using a super bright led, which can be seen easily even in direct sunlight, a must for portable operating. The 4K7 resistor you see across the terminals was used to test the tuning range, 4k7 being an approx of a half wave end fed.

QRSS

I have been setting up Argo for QRSS reception again.I used the FT817ND and inverted V doublet,FT817 set to 10.139.66.

Here is one of the first screen shots taken from Argo.

I set the calibration in argo to 10139650, the FT817ND is set in dig mode and the dial set to 10.139.66

Tak Tenna

I I I I I H Have been building a Tak Tenna with my good friend Frank MW1RES, it is an 80 meter version
and i believe one of the proto types.
Construction was fairly straight forward and we did get some help from Ian G0PLX when we were winding the coils, see the photo, Ian looks at the completed Tak Tenna and admires our handiwork :-)
Frank set the taps for the feed point as per the instructions but as the antenna was indoors it was not the best place to do this.
Later we put it on a 12 foot pole outside and did it again. The SWR was about just a shade under 2:1 and we could have got it much lower if we had carried on checking.
Frank then fed the Tak Tenna into his home made transmatch and the atu easily brought the swr down to 1:1. Then just for fun we tried other bands, leaving the taps where they were and with the transmatch we could get 1:1 on 40,30,20, 17 and 15 meters, we could also get a low swr on 12 and 10 but it was not as easy to tune.
I think for a small footprint and using an atu the Tak Tenna could prove very useful for some one who is short on space. Thanks for asking me to help Frank, enjoyed it very much.