Been using this radio a lot recently and just keep liking it. Hasn’t missed a beat. Had in and out of the car and on the bench in the shack and have worked a pile of DX with her. Most people will mention there is a bit of echo when I run the echo at about 0830 but tell me to leave it alone as it sounds OK.
Waiting on the final version which will be shipped in a few days and will have the following additions. We have had to add a TX clarifier as the radio will drift 170hz or so on SSB. The TX clarifier will be on the same knob but separate to the RX clarifier and the clarifier knob will have to be pushed to activate the TX side. That means you are not chasing your tail in an SSB QSO when both radios are slightly off frequency and both have TX and RX clarifiers that work together. Second addition will be the additional filter in the IF. WE call it band guard and it will be switcheable in or out. PA stage has been slightly redesigned and there will be a fan fitted to the PA. We are looking around for a reasonnably priced AF DSP unit to try to remove the heterodynes from the received SSB audio. This will probably have to be an add on but be great to have it in the radio too. So for now that is it. If the first samples turn out like we hope we will put them straight onto the market.
ETA for sales will be beginning of July but I may be able to sneak a few out before the end of May if the first case arrives in time.
I have been using the set with the Texas Star DX1600 (the sweet sixteen) The output (45-50w PEP) of the Huracan fed into a Texas Star DX500 was producing over 500W PEP but the relays in the DX500 were sticking and it seems I was losing some signal on receive through it as well. time for new relays so untill I do I just switched in the DX1600. Output from the Huracan is now between 950 and 1050 W PEP deending on frequency and mic gain setting. As you can see from the photos I added 4 fans to the top and there are also four fans sucking air from the bottom and blowing into the toroids. Running the DX1600 like this she runs cool and clear. I had to add another power supply as the 110A from the two RM amps just could not keep up with the amp at much over 950w so we added another 40A diamond and that seems to have kept things from shutting down for now. The DX 1600 is capable of somewhere between 1350 and 1500W output depending on the voltage and the drive. personally I like to keep the volts under 14 as the amp runs cooler. You will get more output from more volts but it runs a lot hotter and I have cooked 2 of them already running them at 14.5v so don’t want to make the same mistake again. In fact, I was quite reluctant to fire her up at first but so far she is running perfectly and well withing her limits at around 1kw. Without a doubt this would have to be the best value 1kw CB amp out there. It really does do the "one gallon" and sounds good. Don’t confuse this with a Zetagi. No comparison. It does need fans. It won’t last long without them. I put fans on the bottom because the output combiner for the two 500w sections is a bit light and thats what burnt out on my other two. Took out the finals on one board in the process. To their credit Texas star repaired it for free, but I had to get it back to them in the USA.
If you want to know how the Amp is doing you will need a good power meter and SWR meter on the coax just after the amp and a current meter to let you know what amperage is being drawn from the supplies. With Amp best keep the SWR down below 1.3 if you are going to run her at over 1kw. These amps retail for between US$650-700 in the US but because of the weight they do cost a bundle to ship. Watt for Watt, pound for pound and dollar for dollar: No other amp comes close to this for 1KW SSB audio on 10 and 11m. It is a basic as it gets, They say there is some over temp protection and there is a device hooked up to the heatsink but how it works I have no idea. Frankly I doubt if it does. The problem with these amps is balance. You have 4 boards, the input is split into the four boards and the output from two boards is tied together (combined using a resistor /toroid configuration) and then the two sets of two boards are combined again to give full output to the coax. If you start driving this amp too hard the boards will start getting out of sync with each other and one side will start drawing more amps and things will go rapidly downhill. Some additional devices to maintain stability or to shut her down when she gets unstable would be useful. No filtering at all. The probability of transmitting some hi power harmonics is pretty high. Because it only works from 26 to 29mhz a standard filter with a 30mhz cut off should work fine.
1kw is quite a lot of RF and any appliances in range that are susceptible to RF will suffer. TV’s, Organs , Hi Fi’s, etc . it will blow them away. A dirty signal in equates to a really big dirty signal going out but if you keep things down and your signal clean this amp will more than deliver the goods.
Powermaster power meter