Re: My_Tuning_Constant
The difference of 200 HZ may not be a true measure if you use a frequency counter. I have three very good counters and they are all off by at least that much. A better measure is to use a high quality
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Gary White <white512@...>
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#250
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Re: My_Tuning_Constant
If you take 2^32 and divide it by 125000000, you get 34.359738368, which we will call the "clock factor". The frequency you want is 7.061.8. So what we want to find is what tuning word will "make"
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jjpurdum
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#249
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Re: Dayton Hamvention 2016
If you're interested in QRP, check out the FDIM conference that takes place just before the hamfest. It is also in Dayton and starts on Thursday. The group publishes QRP Quarterly and it's a fun
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jjpurdum
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#248
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Dayton Hamvention 2016
Hola! This is not directly related to the 49er project but I wanted to ask if anybody in the group is planning to attend Dayton this year ? So far, I'm planning to go Friday and Saturday. Of course
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wp3dx@...
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#247
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My_Tuning_Constant
Hi! How did you find the new tuning constant ? The screen on my 49er reads 7.062.0 versus my frequency counter showing 7.061.8. I'm a bit stuck finding my new tuning constant. The formula shows FOUT
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wp3dx@...
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#246
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Re: Delay in Forty 9er Receiver Operation
Ok, I have done extensive testing of the unit and here is what I have found: the delay is exactly 30 seconds (I was really off with my previous estimate of 2 minutes). As soon as I depress the
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Dennis Stage <dennisstage@...>
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#245
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Re: Delay in Forty 9er Receiver Operation
Here is some additional info. The delay is experienced even with the Forty 9er not connected to the DDS. I put both of my Forty 9er boards on a test stand with nothing but an antenna, headphones and
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Dennis Stage <dennisstage@...>
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#244
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Re: Delay in Forty 9er Receiver Operation
Dennis: My units had never exhibited this behavior, so I fired mine up and, after FIVE minutes...nothing. Then I had one of those flat-forehead moments where you slam the heel of your hand into your
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jjpurdum
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#243
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Delay in Forty 9er Receiver Operation
ALL, I have noticed an almost 2 minute delay from the time power is applied to the Forty 9er until receiver actually operates. I get an audio hiss as soon as power is applied, but the actual receiver
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dennisstage@...
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#242
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Re: Low Audio, CP2 Proximity sensitivity
Hi Norbert. Since I was using the RF Probe on my VTVM to get what I *incorrectly* thought was the peak-to-peak value, I simply used it again. However, this time, I used the formula to calculate RMS to
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Aaron Heverin <aaronhev@...>
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#241
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Re: Low Audio, CP2 Proximity sensitivity
You can measure the resistance across R1 before it's part of the circuit and adjust it for max reading. Then you know that it's in the circuit with the highest resistance possible. 73,Jack, W8TEE To:
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jjpurdum
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#240
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Re: Low Audio, CP2 Proximity sensitivity
Hi! Interesting information Aaron, I would not expect the d882 to be tied to the RX side of the circuit. Puzzling indeed, I'll take a closer look at mine tonight. How did you reset the peak to peak
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N Perez <wp3dx@...>
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#239
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Re: Low Audio, CP2 Proximity sensitivity
I'm sure Farrukh and Dennis can give a more precise answer, but I'm pretty sure it's because you put the white smoke back in. Jack, W8TEE To: SoftwareControlledHamRadio@... Sent: Thursday,
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jjpurdum
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#238
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Re: Low Audio, CP2 Proximity sensitivity
Gents, This is indeed a puzzler.. and there's something else I want to bring up on the odd chance that somehow it's related. As you know, I blew out my original D882 output transistor. While I was
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Aaron Heverin <aaronhev@...>
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#237
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Re: Low Audio, CP2 Proximity sensitivity
Keep us posted...this is a puzzle... Jack, W8TEE To: SoftwareControlledHamRadio@... Sent: Thursday, April 28, 2016 6:43 PM Subject: Re: [SoftwareControlledHamRadio] Re: Low Audio, CP2
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jjpurdum
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#236
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Re: Low Audio, CP2 Proximity sensitivity
In the interim, I've ordered another forty-9er kit from a different supplier. I'm going to check each component and compare the two boards. I'll build the new one and try and still figure out what's
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ns3l@...
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#235
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Re: Low Audio, CP2 Proximity sensitivity
Hi Steve. My understanding is that the 2SK30A is installed as a TX Mute transistor. Aaron - N2HTL On Mon, Apr 25, 2016 at 5:26 AM, ns3l@... [SoftwareControlledHamRadio]
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Aaron Heverin <aaronhev@...>
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#234
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Re: Low Audio, CP2 Proximity sensitivity
I'm still thinking some component is bad or perhaps a break somewhere in the board. There are just too many others who have the rig working for it not to work adequately. With your external amp, probe
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jjpurdum
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#233
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Re: Low Audio, CP2 Proximity sensitivity
Aaron, While my 49er has some transmitter problems, the receiver audio level is fine. I am moderately hard of hearing, so a low audio condition would effect me even more than a person with normal
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dfine01
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#232
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Re: Low Audio, CP2 Proximity sensitivity
Interesting....I thought it was my head cold that caused the low audio output. I built an audio signal tracer a while ago that uses a 386 and that output is great....going back to the bench to look at
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kc1at
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#231
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