The original 96MHz x12 chain was at 1150.010 10kHz high could not correct it
Also showing the usual temperature drift as most x-tal 's have and a bit too high in frequency
I cut the 8V supply of the internal X-tal 96MHz x 12 3 stage part
and fitted an SMA for the external l.o. the 1150 is injected trough the 1152 helical filter using a 4.7 pF coupling C . The 10 OHm chip to the disabled tripler transistor was removed.
The signal level at the mixer is enough also with this 10 OHm left in.
My effort to replace the internal l.o. 1152MHz using ADF4351A PLL 35 - 4000MHz demo board
or the GPS locked Progrock oscillator output did not result in a good quality signal.
I decided to buy a DF9NP ready build PLL for 1150MHz switchable between 4 l.o. frequencies.
Very quick build and delivered by Dieter Leupold.
Now with this external PLL the DB6NT 1.3GHz XVTR is almost exact at at frequency.
This PLL standalone is producing a very stable and clean signal at 1150MHz .
using ADF4153 and TCXO 0.5ppm -20 -- +70 C
The IC706 at 146MHz is now the weakest part it needs a warm up time.
But the old IC706 was stable enough for 144MHz WSPR
although it would be nice to have the internal l.o. stabilized same way.
The ADF4351A test board is used as test signal generator
1296.200 and the 10MHz overtone at 1300MHz is still a good strong reference signal
The ADF4351A signal is not as clean as the DF9NP PLL
Standalone with the onboard 10MHz xo reference it is to unstable to be used as local oscillator for 23cm GPS locked it is a very stable test signal.
Picture shows XVTR with Antenna relay and external 1150MHz l.o.
146 - 148 MHz # 1296 1298MHz
The l.o. is switchable to 1152
and can shift - 28 or + 28 MHz for repeater use.
however the DB6NT design is small band using helical bandfilters
i could not get 2W on all shifts
it should be possible to tune the 28 down 1122Mhz and 1150 to have full output.
60m WSPR last night after "repair" high SWR
The 60m WSPR window fits to the older frequency allocation
we are not allowed to TX there
| Timestamp | Call | MHz | SNR | Drift | Grid | Pwr | Reporter | RGrid | km | az |
|---|---|---|---|---|---|---|---|---|---|---|
| 2016-10-19 01:32 | ZS1OA | 5.288692 | -23 | 0 | JF95fx | 5 | PA0O | JO33hg | 9774 | 353 |
| 2016-10-19 03:26 | ZS6KTS | 5.288656 | -25 | 0 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-19 02:58 | ZS6KTS | 5.288656 | -25 | 0 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-19 03:06 | ZS6KTS | 5.288655 | -25 | 0 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-19 02:06 | ZS6KTS | 5.288656 | -25 | 0 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-19 01:48 | ZS6KTS | 5.288656 | -25 | 0 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-19 01:32 | ZS6KTS | 5.288656 | -24 | -1 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-19 01:12 | ZS6KTS | 5.288655 | -25 | 0 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-19 03:38 | ZS6KTS | 5.288656 | -25 | 0 | KG43cw | 5 | PA0O | JO33hg | 9065 | 347 |
| 2016-10-18 23:26 | ZS6SRL | 5.288742 | -22 | 0 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-18 22:58 | ZS6SRL | 5.288742 | -24 | 0 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 02:52 | ZS6SRL | 5.288742 | -20 | 0 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 02:44 | ZS6SRL | 5.288741 | -20 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 02:32 | ZS6SRL | 5.288741 | -17 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 03:12 | ZS6SRL | 5.288741 | -17 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 03:24 | ZS6SRL | 5.288741 | -16 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 01:48 | ZS6SRL | 5.288742 | -18 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-18 23:38 | ZS6SRL | 5.288742 | -21 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 01:24 | ZS6SRL | 5.288742 | -16 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 00:12 | ZS6SRL | 5.288742 | -21 | 0 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 03:44 | ZS6SRL | 5.288742 | -21 | 1 | KG33wv | 10 | PA0O | JO33hg | 9062 | 347 |
| 2016-10-19 02:38 | GM8DOR | 5.288699 | 0 | 0 | IO86ho | 2 | PA0O | JO33hg | 738 | 116 |
| 2016-10-19 03:24 | G4ZFQ | 5.288663 | -23 | 0 | IO90ir | 1 | PA0O | JO33hg | 611 | 59 |
after the long expected rain yesterday the SWR went high on my 30/60/80 triband sloping dipole
i use 25m of H155 50Z 5.2 mm cable
H155 -3dB 100m 10MHz 5kg 100m low weight easy to hoist 20m up together with the 3 dipoles the total weight is reasonable low. AT the cost of some dB loss
And with 5.2mm it can pass trough the choke Ferrite rings used as bal-un
But it's PVC protection outer layer is very thin and after some years it will water in
That happened here the shielding bread and foil is complete oxidated
the core PE foam isolation and center lead look still okay but the PL259 type connectors have to be taped in very well to be water resistant
This cable is the best for its outside dimension to get but it's indoor use.
The PVC outer shield will let in moist at long term.
Still is working well why would oxidation of the outer shield give more attenuation?
As long as the dielectric intern is not damaged the cable should still perform well
Only the skin effect could result in more cable loss.
after i cut off some parts and soldered a new PL259 the cable was okay
But i have to be replaced soon.
Possible with Highflexx 7 -1.9dB 100m 10MHz o.d. 7.3 mm.
Will not pass trough the Ferrite core
Will not pass trough the Ferrite core
7kg/100m 40% heavier
This types are the lowest loss available today at 5.3 / 7.3 mm outside diameter
H155 white corroded bread and foil
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