A panda walks into a restaurant, sits down and orders a sandwich. After he finishes eating the sandwich, the panda pulls out a gun and shoots the waiter, and then stands up to go. "Hey!" shouts the manager. "Where are you going? You just shot my waiter and you didn't pay for your sandwich!"
The panda yells back at the manager, "Hey man, I am a PANDA! Look it up!"
The manager opens his dictionary and sees the following definition for panda: "A tree-dwelling marsupial of Asian origin, characterized by distinct black and white coloring. Eats shoots and leaves."
Included is a totally unrelated selection of linkage devoted to construction and experimentation with Off Center Fed Dipoles , OCFD . Not to be confused with OCD , ADD , ADHD , Asperger syndrome or , look, squirrel !!
http://www.wb5cxc.com/design_eh.html
http://hamwaves.com/cl-ocfd/en/index.html
https://www.w8ji.com/windom_off_center_fed.htm
http://www.kn9b.us/guanella-balun
The facts . Only the facts ...The uPD858 has a 7.8mhz IF and and Offset Oscillator frequency of 33.855 (result of a tippler from 11.285) with a VCO frequency of 34.765mhz and a PLL "N" code of .91 for channel 1 (11m) .
With an IF of 7.8mhz and change the Offset Oscillator of 10.4mhz the resulting output frequency with an "N" code of 100 is 3.6mhz .This results in a VCO Frequency of 11.4mhz
The MB8719 with pin "10" low (142GTL COBRA et all) also has an IF of 7.8mhz and an Offset Oscillator frequency of 33.335mhz and a PLL "N" code of 1.43 for channel 1
With an IF of 7.8mhz and change the Offset Oscillator of 9.97 the resulting output frequency with the original "N" code of 143 is 3.6mhz . this also results in a VCO Frequency of 11.4mhz
The MB8719 with pin "10" high (148GTL COBRA et all) also has an IF of 7.8mhz and an Offset Oscillator frequency of 33.975mhz and a PLL "N" code of .79mhz for channel 1
With an IF of 7.8mhz and change the Offset Oscillator of 10.61 the resulting output frequency with the original "N" code of .79 is 3.6mhz . this also results in a VCO Frequency of 11.4mhz
Then the Panda ...
The PLL02A SSB . Has an IF Oscillator Frequency of 10.695 and a VCO Frequency of 17.555mhz . With an Offset Oscillator Frequency from the doubler of 20.105mhz (10.0525mhz) and counting down to go up from "2.55" "N" code results in channel 1 .
The PLL02A with an IF of 10.695mhz and an Offset Oscillator frequency of 8.4225mhz and a PLL "N" code of 255 for channel 1 results in 3.6mhz. The VCO output is now 5.8725.
eats , shoots ...
Just the crystals for these conversions would hurt a wallet . All but the PLL02A need three crystals . The PLL02A needs two .There is an alternative . The LTC1799 VCO . I've included an attachment .With nothing but a resistor to adjust for frequency and all these modifications having a doubler or tippler already in place to be re-purposed for for a buffer/amplifier what could go wrong ? The Ltc1799 can be had for as little as $10 on a board with a bypass cap and multi turn potentiometer . Check ICM (note ICM has just announced it it closing its doors after near 70 years ) crystal prices lately ? Of course the tippler transformer and the VCO transformer would have to be re-tuned as well as the plethora of 3.5mhz transformers to make the RX and TX chains work . After that getting the RF through a 3 watt driver and 12 watt final would be trivial .
Look , I haven't contributed a lot to discussion here . I have been doing this for ever . My mind sometimes wanders . I have been known to modify a radio or six in the last 30 years . If I haven't contributed anything worth while this time at least I got a laugh .
...and leaves .
The panda yells back at the manager, "Hey man, I am a PANDA! Look it up!"
The manager opens his dictionary and sees the following definition for panda: "A tree-dwelling marsupial of Asian origin, characterized by distinct black and white coloring. Eats shoots and leaves."
Included is a totally unrelated selection of linkage devoted to construction and experimentation with Off Center Fed Dipoles , OCFD . Not to be confused with OCD , ADD , ADHD , Asperger syndrome or , look, squirrel !!
http://www.wb5cxc.com/design_eh.html
http://hamwaves.com/cl-ocfd/en/index.html
https://www.w8ji.com/windom_off_center_fed.htm
http://www.kn9b.us/guanella-balun
The facts . Only the facts ...The uPD858 has a 7.8mhz IF and and Offset Oscillator frequency of 33.855 (result of a tippler from 11.285) with a VCO frequency of 34.765mhz and a PLL "N" code of .91 for channel 1 (11m) .
With an IF of 7.8mhz and change the Offset Oscillator of 10.4mhz the resulting output frequency with an "N" code of 100 is 3.6mhz .This results in a VCO Frequency of 11.4mhz
The MB8719 with pin "10" low (142GTL COBRA et all) also has an IF of 7.8mhz and an Offset Oscillator frequency of 33.335mhz and a PLL "N" code of 1.43 for channel 1
With an IF of 7.8mhz and change the Offset Oscillator of 9.97 the resulting output frequency with the original "N" code of 143 is 3.6mhz . this also results in a VCO Frequency of 11.4mhz
The MB8719 with pin "10" high (148GTL COBRA et all) also has an IF of 7.8mhz and an Offset Oscillator frequency of 33.975mhz and a PLL "N" code of .79mhz for channel 1
With an IF of 7.8mhz and change the Offset Oscillator of 10.61 the resulting output frequency with the original "N" code of .79 is 3.6mhz . this also results in a VCO Frequency of 11.4mhz
Then the Panda ...
The PLL02A SSB . Has an IF Oscillator Frequency of 10.695 and a VCO Frequency of 17.555mhz . With an Offset Oscillator Frequency from the doubler of 20.105mhz (10.0525mhz) and counting down to go up from "2.55" "N" code results in channel 1 .
The PLL02A with an IF of 10.695mhz and an Offset Oscillator frequency of 8.4225mhz and a PLL "N" code of 255 for channel 1 results in 3.6mhz. The VCO output is now 5.8725.
eats , shoots ...
Just the crystals for these conversions would hurt a wallet . All but the PLL02A need three crystals . The PLL02A needs two .There is an alternative . The LTC1799 VCO . I've included an attachment .With nothing but a resistor to adjust for frequency and all these modifications having a doubler or tippler already in place to be re-purposed for for a buffer/amplifier what could go wrong ? The Ltc1799 can be had for as little as $10 on a board with a bypass cap and multi turn potentiometer . Check ICM (note ICM has just announced it it closing its doors after near 70 years ) crystal prices lately ? Of course the tippler transformer and the VCO transformer would have to be re-tuned as well as the plethora of 3.5mhz transformers to make the RX and TX chains work . After that getting the RF through a 3 watt driver and 12 watt final would be trivial .
Look , I haven't contributed a lot to discussion here . I have been doing this for ever . My mind sometimes wanders . I have been known to modify a radio or six in the last 30 years . If I haven't contributed anything worth while this time at least I got a laugh .
...and leaves .
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