AmateurRadio.com

Series Six Episode One of the ICQ Podcast has been released. News Stories include :-

• Library receives Ham Radio books
• Attracting newcomers to Ham Radio
• A multi-purpose portable satellite station
• End of the World Station contacts OSCAR Satellite
• GB3JB - Off-The-Air
• Irish radio amateurs get new MF allocation
• DL50FRANCE
• Higher power trial in Australia
• Tasmanian bushfire disaster
• Counterfeit Icom exploding battery alert
• Mayor visits amateur radio station G100RSGB

listener mailbag and Australia update from Ed Durrent VK2JI and Martin reviews antennas.

Colin Butler, M6BOY, is the host of the ICQ Podcast, a weekly radio show about Amateur Radio. Contact him at [email protected].

After seeing my post about the fun and games with the UV-5RA yesterday, Steve G1KQH kindly dropped me a note to say that there are two versions of the UV-5 software. One of these can be used with the UV-5R and one which may be used with the newer models.

These may both be downloaded from the Sinotel site, along with many other utilities

Thanks, Steve!

Tim Kirby, G4VXE, is a regular contributor to AmateurRadio.com and writes from Oxfordshire, England. Contact him at [email protected].

I did something new tonight. I had my first QSO on the 60 Meter band.

I saw an article on the ARRL’s Website that gave the frequencies for the centers of each “channel”, so I thought I would give it a go. Plus the fact that I wanted to do something other than take part in the NAQP.

So I called CQ on “channel 3”, which is 5.3585 MHz. I was answered by Dick W3ORU who was 599 plus into NJ. He gave me a nice report, also. We had a nice chat until the dinner call came. Dick gave me the lowdown on what I can expect to see on the band.

Definitely not used to the ” channel” concept, but I had a nice time, anyway. I am looking forward to more QSOs on 60 Meters.

72 due Larry W2LJ
QRP – When you care to send the very least!

Larry Makoski, W2LJ, is a regular contributor to AmateurRadio.com and writes from New Jersey, USA. Contact him at [email protected].

A few days ago, I was chatting to Andy G6REG and he mentioned that he needed a lead to help program his UV-5. Rather than have him wait to order one from Hong Kong, I suggested that I send him my lead so that he could could get started straight away.

Life’s never quite that simple though. The lead arrived with Andy and he installed the drivers but on running up the Baofeng programming software, it wouldn’t talk to the radio.

At that stage we thought it was a driver issue on Andy’s laptop. Andy decided to order a lead and driver anyway and return the lead to me. On a whim, he suggested that he send me one of the radios to see if I could program it.

When I opened the packet, I immediately noticed that Andy’s UV-5 was different to mine – it’s a UV-5RA. I made sure that the programming lead was working on my laptop and then ran up the software and downloaded the memories from my UV-5. So far so good!

Then I tried to write the memories back to Andy’s UV-5. No! Communication fault. It was then that I realised that the Baofeng programming software that I had used to program my UV-5 would not work with the later model!

A quick Google around revealed that this was indeed the problem and that others had got around it by using the CHIRP programming software. It seems that the ‘stable build’ version of CHIRP (0.2.3) does not support the UV-5, however, the latest  daily build does. This I was able to download here

I also found some interesting notes about programming the UV-5 with Chirp

CHIRP installed readily and I was quickly able to download an ‘image’ of my UV-5R and save it. I then tried to write it back to the UV-5RA. The first time I did it, an error occurred, however, I remembered I had seen this on a first communication before and persisted.

Yes! Second time through and CHIRP was able to write the memories back to Andy’s UV-5RA.

So there we have it. Most likely, Andy didn’t have a driver issue on his laptop. At that stage we didn’t know that the basic Baofeng UV-5 software didn’t work with the new style rig, so I suspect that had he installed CHIRP it would have probably worked fine.

Tim Kirby, G4VXE, is a regular contributor to AmateurRadio.com and writes from Oxfordshire, England. Contact him at [email protected].

Some time ago, I qualified for 50 MHz VUCC from another location (rare grid DM67, operating portable). Lately, I have been racking up grids on 6 Meters from my cabin in DM78. Since a VUCC award is good for a set of locations that are within 200 km of each other, these new contacts count as a separate VUCC award entry. After … Continue reading …
Bob Witte, KØNR, is a regular contributor to AmateurRadio.com and writes from Colorado, USA. Contact him at [email protected].

In 2012 according to my log all my contacts were CW and QRP or QRPp type contacts. This is the 3rd year that I have made just CW contacts. The reason being SSB in the past would bother my neighbours and since this is a stealth operation SSB is OUT. As for the digital modes I just have a very low frustration factor not a good combination for setting up digital modes. Maybe 2013 will have me mellow a bit to try the digital modes again.

2012	100	500	CW: 100.00% Phone: 0.00% Data: 0.00%
2011	49	258	CW: 100.00% Phone: 0.00% Data: 0.00%
2010	25	170	CW: 100.00% Phone: 0.00% Data: 0.00%
2009	10	192	CW: 19.27% Phone: 0.00% Data: 80.73%
2008	45	495	CW: 36.57% Phone: 0.00% Data: 63.43%

Club log was great in helping me get a snap shot of my log for 2012. According to Club log I was able to hit 125 QRP DXCC contacts for the year! Unfortunately I was not able to qualify for the ARRL DXCC Jubilee award as they were not counting all the DXCC entities. I was able to accumulate 83 DXCC's toward that award but this award only ran for the year of 2012 so I came up short.
My contacts for the year were 500, I thought it was a lot more but there were times I would forget to log contacts. BUT I almost doubled my contact total from the year before of 258. Seems I have to get away from the soldering iron and on the rig more!!
I was able to make it into 23 CQ zones
Some of my highlight contacts were Gibraltar, Iceland, Kazakhstan, Jordan and ST. Pierre & Miquelo.
Finally I was able to better my 1,000 miles per watt distance to 45,869 miles per watt with a QRPp contact to HA8JV with 100mWs of power.
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].

CheckSR result at 48kHz with internal sound card

I have several radios connected to my shack PC. For the audio interfacing I have several sound cards or sound devices since most of them are not internal cards but use USB ports. I wanted to make sure the rig I mostly use for digimodes used the best sound card I had so I thought I would do some tests.

Some people believe it’s better to use a high end sound card for radio work. I don’t think there is any benefit for HF use as the noise level will be much higher than even the poorest sound card. There is no advantage to using a device capable of more than 48kHz sample rate unless you are using SDR software and need the extra bandwidth.

The one factor that can really made a difference is the accuracy of the sample rate. Most digimode software uses either 11025Hz or 48000Hz. There is no theoretical advantage to using a faster than 11025Hz rate for terrestrial digimodes. A 48kHz sample rate should not give any benefit and will need more CPU cycles to transfer and process the extra samples.

Sample rate accuracy is important because it affects both the pitch of playback and the data rate. It’s like playing an LP at the wrong speed. If you play a 33rpm LP at 45rpm the music is played at a higher pitch and a faster tempo. If played at a lower speed the sound is lower pitched and slower. This is analogous to what happens if the sample rate of your sound card is not exactly what your digimode software expects it to be.

I tested a number of sound devices using CheckSR.exe. This is a utility that is distributed with the MixW digimode software, but you can probably find it on its own if you Google it. To use it you simply select sound devices for input and output and set the sample rate you wish to test. You then run it until the measured sample rate settles on a stable figure.

I tested the Realtek sound cards built into my shack PC (HP) and a laptop (Dell) using both 11025Hz and 48000Hz sample rates. Both sound cards were as close to the specified sample rate as makes no difference.

CheckSR result at 11025Hz with USB device

I then tested a number of USB devices ranging from a $1 audio ‘dongle’ to a $10 model with surround sound and SP-DIF inputs and outputs. The drivers for these devices had names like ‘USB sound device’, ‘Generic USB sound device’ and  ‘USB headphone set’. These devices were also close to spot-on at 48000Hz.

But at 11025Hz every single USB device had a measured sample rate of 11100Hz – 1% faster than specified. This would make a 1kHz audio tone play at 1010Hz, whilst a 1200baud APRS packet would be transmitted at a rate of 1212baud. This error is more than enough to prevent decoding of an FSK packet signal. Other digimodes are also subject to sample rate errors. If you have ever seen a PSK or Olivia  signal that is strong and clear yet decodes as garbage, an incorrect sample rate (at one end or the other) is the reason.

I was surprised that the sample rate error at 11025Hz was consistent across all USB device samples. This suggests to me that the measured rate of 11100Hz is a factor of the drivers for these devices which may not run at the speed you select but instead resample down from a native speed of 48kHz. It would be interesting to see the results of running CheckSR on some branded USB devices or SignaLink USB interfaces that have their own drivers.

I ran some tests on USB devices at other sample rates. There was no consistency. At 8000Hz the measured rate was fast by a significant amount, but 16000Hz it was slower.

The results suggest that USB audio devices are only as good as internal sound cards if a 48000Hz sample rate is used. The use of lower sample rates with USB devices should be avoided.

Julian Moss, G4ILO, is a regular contributor to AmateurRadio.com and writes from Cumbria, England. Contact him at [email protected].