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eHam Forums / Misc / RE: Anyone else aggravated.......
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on: March 12, 2013, 07:58:32 AM
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I linked and synced my emails with my smart phone. Anytime a message comes in I get a notification real time and can respond quickly. No muss, no fuss, and at bed time the phone is turned off until the next morning, it works great for getting a message, text or a call and I don't get disturbed. cheers.
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eHam Forums / Elmers / RE: mfj-9440 travel transceiver
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on: February 25, 2013, 12:23:42 PM
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There's a component position drawing in the on-line manual along with instructions on how to set the AGC pot and the S-Meter zero pot on the PC board. One or both of those setting being off could cause the S-meter to read high.
Thanks, I've done that, still have the issue. I will get my schematic this week, it's not here. I have a hard time reading the schematics in PDF format. thanks again for the comments so far. cheers. |
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eHam Forums / Elmers / RE: mfj-9440 travel transceiver
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on: February 25, 2013, 09:05:26 AM
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Thanks for the response, I am aware of the method you describe but I don't see anywhere to adjust the meter circuit. That's my question. I've done an alignment as per the manual and still have the same issue. I've called mfj and they said to replace the meter, and they sent one to me free of charge. I didn't think it would help, but I did replace it and I don't see any change. Thanks for your time.
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eHam Forums / Elmers / mfj-9440 travel transceiver
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on: February 25, 2013, 08:35:32 AM
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Anyone know if there is a way or procedure to calibrate the receive signal on the "S" meter. Not a sensitivity issue, just an "S" meter that reads very high, in fact it pins the needle on just moderate signals. Thanks for reading.
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eHam Forums / QRP / RE: MFJ-9440X - what power supply?
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on: February 01, 2013, 06:34:01 AM
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Greetings, does anyone know the voltage range of these transceivers? The manual states 13.8 nominal but no lower and upper limit, such as 13.8 VDC, +/- 10 %. I suspect that is right. I want to use it mobile and my alternator charges at about 14.5 volts. Any idea if this is a safe upper limit, and how low has anyone gone before the rig is unstable. Thanks for any insight. cheers.
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eHam Forums / Elmers / RE: Icom IC-735 Panel Lamps
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on: January 25, 2013, 07:35:34 AM
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A couple of the panel lamps on my IC-735 have gone out. Does anyone know if there is a suitable replacement I can pick up at Radio Shack?
Thanks, 73s, Scott, N6CIC
Scott, if you are still Auga Dulce drive to All Electronics in Van Nuys, at the corner of Oxnard and Kester, just off the 405 freeway. They have an assortment of lamps and LED's. If you were not aware of All Electronics that is. cheers. |
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eHam Forums / Elmers / RE: What is a Good price for a used Yaesu FT-450
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on: January 25, 2013, 07:28:54 AM
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I've recently returning to ham radio after a 15 year absence. I got rid of all my gear years ago and am basically starting from scratch and might as well say I am a "newbie"
I don't know anything about the current radios or what they are worth. A fellow ham has a Yaesu FT-450 he bought at an estate sale which he intends to sell on Ebay but has given me first refusal.
My question is: What is it worth? I want to be fair but I also don't want to pay more than its worth. I am starting over and have a relatively small budget so I need to make the best deals possible. I've looked online but mostly see quotes for later models such as the FT-450D and the prices range from $550-950, used
Check AES and the other ham retailers "used list". I bought a used FT-450 for $500.00 from AES. It came with a 30 warranty and a $500.00 credit if I wanted to upgrade to a more expensive radio. I didn't. The FT-450 is a great value for the $500.00 to $600.00 range. Hard to beat. cheers. |
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eHam Forums / Misc / RE: Looking at getting a new HF radio
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on: November 12, 2012, 07:51:47 AM
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I agree with the last post, the 718 has a very noisy RX, the 735 is a lot quieter I've had both. I replaced the 735 with a ft-450 by Yaesu. I'm very happy with it. It has a very good receive that I can listen to for hours. I have never had a Yaesu ft-950 but imagine it's very nice too, although more money. cheers. PS. I paid $450.00 used for my ft-450 for comparison, plain jane version with no ATU.
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eHam Forums / Misc / RE: Dummy load questions
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on: October 01, 2012, 10:16:12 AM
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BRG: You don't buy a heatsink for this dummy load. These resistors are suspended in a can of oil. The new Caddock and Bourns TO-220 non-inductive resistors would be mounted on a large heatsink. I've just started to use these interesting devices.
There are basically two kinds of dummy loads. One is the "dry" type which uses cluster of non-inductive resistors or one large non-inductive resistor mounted in a cage to minimize RF radiation. Some of these "dry" dummy loads are cooled by air circulating through the cage and some have a fan to force cooling air for the resistor(s)
The second kind is the "wet" type dummy load which consists of a bank of non-inductive resistors or a single large resistor suspended in a can of transformer oil or mineral oil. The oil acts as a coolant.
While the homebrew dummy load you note will work great, it must be understood that it's rated for less than 200W and for a short period of time. In most cases this will be fine. If you have to do extended testing of your transmitter then you'll find yourself waiting until the dummy load cools. Dummy loads can't be "pushed" too far beyond their ratings because as the resistor(s) heat the resistance changes.
If you have a linear or intend to get a linear sometime in the future, you might want to consider biting the bullet and buy an MFJ Cantenna type wet dummy load which will handle 2KW.
I built a dry dummy load for QRP which works fine but I also have a Heath Cantenna at my operating position for my 100W transceiver and 2 amps. I use a laboratory dial type thermometer to monitor the temperature of the oil.
You misunderstood my reply, I am only offering the original poster another option for a dummy load, I have an oil filled D/L, I built years ago and it has served me well. I use it on all my repairs of hy-brid rigs and it works great. Here it is again. Take a look ZOL. http://k4eaa.com/dummy.htmlto be clear, this is another type of D/L that uses oil to dissipate heat created by RF. cheers. |
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eHam Forums / Misc / RE: Dummy load questions
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on: October 01, 2012, 07:00:59 AM
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KJ6ZOL I found the N4SPP dummy load plan via google. If anybody is familiar with this plan (google "diy dummy load") can you tell me what I should look for in a heatsink? There are all different kinds of large heatsinks on Ebay. How do I know which one I should buy? [/quote] check this homebrew D/L out. cheers. http://k4eaa.com/dummy.html |
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eHam Forums / Misc / RE: Dummy load questions
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on: September 30, 2012, 06:35:09 AM
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As everybody knows, I'm new. I want to know, what exactly is the use of a dummy load, when would you use it? I gather that it's for adjusting the transceiver without accidentally transmitting spurious or illegal signals.
It's a known 50 ohm load for the transceiver to "see" during testing, trouble shooting, as well as tuneups on boat-anchor rigs. An oil filled dummy load is a useful piece of test equipment and is a easy first project for a new ham. A few resistors and a empty quart size paint can, and a bit of mineral oil will give you a 100 watt dummy load for about $25.00 in parts. cheers. |
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