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<DIV><FONT face=Arial size=2>There may be a simpler way to do this. Both
Mercury and Penelope will respond to, and generate, alias signals.
For example, if Mercury is using a 125MHz clock and it is tuned to
19MHz then due to aliasing there will also be responses at </FONT></DIV>
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<DIV><FONT face=Arial size=2>125 - 19MHz = 116MHz </FONT></DIV>
<DIV><FONT face=Arial size=2>125 + 19Mhz = 144MHz</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Normally for HF use these signals will be rejected
by the input filters. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>With the LT2280 evaluation board I'm using to
prototype Mercury the sensitivity at 144MHz is only 1dB lower than that at
19MHz. In the design of Mercury we have allowed for the switching out of
the input filters. So, with a suitable pre-amp and filter Mercury will work on
2m. In fact I've just been listening to the local 2m repeater using the
prototype! </FONT></DIV>
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<DIV><FONT face=Arial size=2>Similarly, we can tap the output of the DAC on
Mercury and have a few mW on 2m which again can be amplified and filtered to
give a 2m signal. </FONT></DIV>
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<DIV><FONT face=Arial size=2>73's Phil...VK6APH </FONT></DIV>
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<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"><BR><BR><B><I>Tony
Langdon <<A href="mailto:vk3jed@gmail.com">vk3jed@gmail.com</A>></I></B>
wrote:<BR>>Another thing, it would be nice to have at least the full 4 MHz
range <BR>>of 2m in the transverter, possibly even more, if there is any
intent <BR>>to use it as an IF for higher bands. And the IF for the
transverter <BR>>could be anywhere. Is it better to have it in or out of a
ham band?<BR><BR>With software, I couldn't see why this couldn't be possible.
At least have the ability of the LO in the transverter to change frequency to
provide the full 4 meg range. But it would be a lot easier (I think) to go
28-32 Mhz via Penelope and Mercury.<BR><BR>>Full duplex would be nice.
Satellite work is normally crossband <BR>>though. Full duplex on 2m in this
instance is probably going to be <BR>>most useful for L/V, L/S and
higher microwave bands, where the 2m I/O <BR>>is being used as an
IF.<BR><BR>That's the idea of separating the TX and RX of the transverter to
provide this cross-band function. Especially since Penelope and Mercury are
separate themselves. Plus the TX or RX could have the ability to be
bypass.<BR><BR>I think it should call it an IF Upconverter (IFU) instead of a
transverter so we can reduce confusion.<BR><BR>73's Chris N0TTW<BR><BR><BR>
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