According to the Telepost manual if you use a mic input you will probably have to attenuate the signal and possibly isolate it with a galvanic transformer.
I thought I would try wiring it to pin 1 of the accessory port. This worked expect I can only drive the rig to 1 watt which has little value.
From the manual.
Test Tones: Audio output for built in test tones. 3.5mm mono. Connects to the MIC or LINE input of the rig. An attenuator will be needed in the case of mic input, and possibly galvanic isolation (transformer). Interfaces designed for a sound card based RTTY setup can work for this, but the existing commercial ones that I have tested have some deficiencies.
Line Level... Most rigs have a high Z (10K) line input designed for sound card based digital modes. These inputs work well for the LP-500 test tones. One some rigs they are labeled as line inputs, and have dedicated RCA or 1/8” (3.5mm) jacks. On some rigs they are part of an ACCessory jack or a RTTY jack. These are generally DIN type connectors. Consult your user manual for specifics.
So looking for suggestions on how to do this. I am using the balanced line input for audio so have that tied up.
James, I might have to use the foster connector for now.
Out of curiosity what does your two tone look like on your Flex?
Playing with something like this is new to me. But this does not look good?
Larry, as I said above I tried Pin 1 but even with radio power level at 100 watts the two tone will only drive the radio to around 1 watt.
This is from Larry at Telepost.
-10 dBV is 894mV p-p. The output of LP-500 is 350 to 500 mV p-p into a 10K load depending on the test signal, which is roughly 6 dB lower. I would think the input would have a range of plus and minus something relative to -10 dBV, but maybe it's just an attenuator on the input with no gain at all.
I thought my balanced line input looked cleaner but maybe not.
So without sticking my neck out too far it appears the isolation in the iPlus helps the bumpy issue.
Any of you LP-500/700 guys have interest in joining a group on this product? Larry has a Yahoo Group for the LP-100 but not the 500/700. I was thinking about starting one on Yahoo so we don't take over the forum here. I am not a fan of Yahoo but figured we should stick to the same format as the LP-100 in case Larry decides to take ownership of it.
The post above was from Craig K0CF on the yahoo group.
Regardless of what type if input I use it is going to need some sort of line isolator. The iBox will be here in a few days so will see how it works. The nice thing about the iBox is it also has an attenuation adjustment so I should be able to dial that in.
OK, so I received the 600 to 600 ohm audio isolation transformers and it solved the ripple in the wave form problem. This is inputting the 2 tone test signal into the accessory plug. I am using the processor in order to have close to 70 watts output with the 2 tone signal.
in PowerSDR...under the 'Tests' tab....two tone generator, signal generator...
nothing else was needed...and, early on, we even got a hint BITE might be available
in SmartSDR....but, it never happened...
'just sayin...' 73, w5xz, dan