开云体育

Hi all

I bought a more or less cheap 10m/2m transverter from and gave it a try with my KX2 and of course my TX-500.

All frequency messurments were made with a highly precise frequency counter. All components were switched on 30min before tests started.
The first tests were to see the frequency? offset between the display on the TRX and if there is any drift. Offset was taken in receive mode and drift was taken sending out a CW signal for 30sec
HF Power was set to 5 watts. Transverter not connected.

TX-500:
7 MHz offset 11Hz / Drift ~ 1Hz every 10 sec
10 Mhz offset? 31Hz / Drift ~ 1Hz? every 10 sec
14 Mhz offset 45Hz / Drift ~ 10 Hz every 10 sec
28 MHz offset 73Hz / Drift ~ 73(!) Hz every 10 sec

KX2:
7 MHz offset 5Hz /? Drift ~ 1Hz every 10 sec
10 Mhz offset? 25Hz / Drift ~ 1Hz? every 10 sec
14 Mhz offset 40Hz / Drift ~ 1 Hz every 10 sec
28 MHz offset 70Hz / Drift ~ 5 Hz every 10 sec

The display offset is little better on the KX2 and less drift, but really not much. But BUT, I compared the values to an FT-817ND with installed TXCO, The display offset was about the same, but NO drift at all!

Then I used the 10m/2m transverter.

TX-500
Display offset increased by 400Hz and drift increased by 10Hz every 10 sec

KX2:
Display offset increased by 400Hz as well and drift increased by 10Hz every 10 sec

There is a transverter with installed TXCO, but mine has none.

In real-outdoor-field-operations there shouldn't raise any problem. The TX-500 is running digi-modes just fine.

To be honest I am not a pro when it comes to HF mesurements, just a normal Ham :-)

73 stay save and healthy

Stephan




--
DF6PA
Licensed since 1978
TX-500, KX2, IC-703, FT-817ND

Hi Stephan,

have you done this test with full output power, or only 1Watt or 5Watt?
It could be a thermic problem than doing a long transmisson, like WSPR.
Is that correct, a installed TCXO with 2.5ppm?

(little bit off topic in this thread)
I have another question about the current consumption in RX with DIF function (IF DSP) on and off, have you tested this
on different bands? I've asked another ham about the "homodyne" technology (written in the manual). It's not so clear...
Usually this will be a direct conversion receiver.
He says, if the the HF goes through the I/O mixer down to zero, and the signal processing is calculated in the baseband,
they need less processing power, but has a lower dynamic range (Sherwood list: 79db). This could result in lower current consumption.

I'am pre-orderd mine last month and wait.........

Thanks.
Regards, Nino

Hi Nino

all tests were made with rf power set to 5 watts.
The txco is only installed in the FT-817ND. TX-500 and KX2 don't have txco.

Never looked for the power consumption, but it is a great idea for next tim :-)

I hope you will get your rig soon!

73, Stephan

--
DF6PA
Licensed since 1978
TX-500, KX2, IC-703, FT-817ND

Good morning Stephan,

the TX-500 has a TCXO installed with 2.5ppm.

Looking into a transverter for SOTA work. Unfortunately the company you mentioned is under the stress of Russian occupation and closed his store.?

Have you done much more work with the transverter and tx500?

Thanks in advance!

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p4432023.m570.l1313&_nkw=transverter&_sacat=0

I purchased one of these from this seller. It works fine with the TX-500 however there are two points to note:

1. The transverter is auto detect keying, which appears to be fast but does mean the SWR presented to the transceiver is initially high but then rapidly falls to ~1:1. At low power this shouldn't be a problem.
2. I found that with mine it is really easy to over drive and I needed to put in less than 5W to the transverter to get about 10W out on VHF FM. At 7W it was completely over driving the transverter with terrible distortion and about 20W o/p.
3. There are harmonics on the o/p every multiple of the IF and the IF plus the o/p F. I resolved this with a 100W band pass filter for 144 MHz that I bought on Aliexpress that works very nicely, and completely cleans the o/p in accordance with the specs described by the seller.